DE102004028916A1 - Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade - Google Patents
Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade Download PDFInfo
- Publication number
- DE102004028916A1 DE102004028916A1 DE102004028916A DE102004028916A DE102004028916A1 DE 102004028916 A1 DE102004028916 A1 DE 102004028916A1 DE 102004028916 A DE102004028916 A DE 102004028916A DE 102004028916 A DE102004028916 A DE 102004028916A DE 102004028916 A1 DE102004028916 A1 DE 102004028916A1
- Authority
- DE
- Germany
- Prior art keywords
- rotor blade
- blade
- blade according
- opening
- porous material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000011148 porous material Substances 0.000 title claims abstract description 24
- 239000006260 foam Substances 0.000 title claims description 3
- 230000005494 condensation Effects 0.000 title description 2
- 238000009833 condensation Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 239000006261 foam material Substances 0.000 abstract 1
- 238000013459 approach Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/30—Lightning protection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/60—Fluid transfer
- F05B2260/64—Aeration, ventilation, dehumidification or moisture removal of closed spaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/10—Inorganic materials, e.g. metals
- F05B2280/102—Light metals
- F05B2280/1021—Aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
- F05B2280/6012—Foam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
- F05B2280/6014—Filler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/14—Foam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/18—Filler
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
Description
Die vorliegende Erfindung betrifft ein Rotorblatt für eine Windenergieanlage. Rotorblätter moderner Windenergieanlagen besitzen in der Regel zwei Halbschalen. Zwischen den Halbschalen befinden sich große Hohlräume, in denen sich infolge von Kondensation oder direktem Eindringen Wasser sammelt. Wenn dieses Wasser nicht abgeführt wird, besteht im Winter die Gefahr, daß das gefrorene Wasser das Rotorblatt beschädigt oder gar zerstört. Auch besteht die Gefahr, daß infolge von Blitzschlag in das Rotorblatt es zu einer explosionsartigen Verdampfung des Wassers kommt, so daß auch hierdurch das Rotorblatt und sein Aufbau zerstört werden können.The The present invention relates to a rotor blade for a wind turbine. Rotor blades modern Wind turbines usually have two half shells. Between The half-shells are large cavities, in which as a result from condensation or direct penetration collects water. If this Water not drained There is a risk in winter that the frozen water will Rotor blade damaged or even destroyed. Also there is a risk that due to from lightning in the rotor blade it becomes an explosive Evaporation of the water comes, so that thereby the rotor blade and destroyed its construction can be.
Es ist bekannt, in der Spitze des Rotorblatts Bohrungen zur Entwässerung vorzusehen. Diese Bohrungen werden an Stellen angebracht, die beim normalen Betrieb der Windenergieanlage sicherstellen, daß kein Wasser im Rotorblatt verbleibt. Die Größe dieser Bohrungen ist jedoch unter dem Gesichtspunkt des Lärmschutzes begrenzt, da die hohe Anströmgeschwindigkeit an dem Rotorblatt zu Geräuschen führt.It is known, in the tip of the rotor blade holes for drainage provided. These holes are placed in places that are normal Operation of the wind turbine ensure that there is no water in the rotor blade remains. The size of this However, drilling is from the point of view of noise protection limited because of the high flow velocity to the rotor blade to noise leads.
Neben dem Wasser in dem Rotorblatt befinden sich im Inneren des Rotorblatts in der Regel auch Schmutz, Staub und abgelöste Kleinteile aus der Fertigung des Rotorblatts. Ebenso wie das Wasser werden diese Teile unter dem Einfluß der Zentrifugalkraft in dem Rotorblatt bewegt. Dies birgt die Gefahr in sich, daß die Entwässerungsbohrung durch ein Gemisch aus Staub, Schmutz und Wasser verstopft und sich auf Dauer zusetzt.Next The water in the rotor blade is located inside the rotor blade usually also dirt, dust and detached small parts from the production of the rotor blade. Just like the water, these parts are under the influence of Centrifugal force in the rotor blade moves. This carries the danger in itself, that the drain hole clogged by a mixture of dust, dirt and water and become permanently added.
Aus
Aus WO 02/48546 A1 ist die besondere Ausgestaltung eines Blitzfängers bekannt, der in einer Bohrung in der Blattspitze angeordnet ist. Blitzfänger und Bohrung bilden gemeinsam eine Entwässerungsöffnung. Nachteilig an dieser Konstruktion ist jedoch, daß auch diese Öffnung sich durch Schmutz und Kleinteile zusetzen kann.Out WO 02/48546 A1 discloses the special design of a lightning trap, which is arranged in a hole in the blade tip. Lightning catcher and Bore together form a drainage hole. A disadvantage of this Construction is, however, that too this opening can become clogged with dirt and small parts.
Der Erfindung liegt die Aufgabe zugrunde, eine Entwässerungsbohrung für ein Rotorblatt einer Windenergieanlage zu schaffen, die leicht herstellbar ist und ein Zusetzen erfolgreich verhindert.Of the Invention is based on the object, a drainage hole for a rotor blade To create a wind turbine that is easy to produce and successfully prevented clogging.
Erfindungsgemäß wird die Aufgabe durch ein Rotorblatt mit den Merkmalen aus Anspruch 1 gelöst. Vorteilhafte Ausgestaltungen bilden die Gegenstände der Unteransprüche.According to the invention Problem solved by a rotor blade with the features of claim 1. advantageous Embodiments form the subject of the dependent claims.
Das erfindungsgemäße Rotorblatt besitzt mindestens einen Hohlraum, der an eine Außenwand des Rotorblatts angrenzt. Die Außenwand des Rotorblatts besitzt mindestens eine Durchbrechung, in der ein poröses, wasserdurchlässiges Material angeordnet ist und die Durchbrechung verschließt. Bei der Erfindung ist an der Außenseite des Blatts keine Öffnung vorhanden, an der Lärm entstehen könnte. Hierdurch kann die Durchbrechung in einer geeigneten Größe gewählt werden, um ausreichend Wasser abzuführen. Das Wasser wird durch das poröse Material aus dem Innenraum des Rotorblatts heraustransportiert.The Rotor blade according to the invention has at least one cavity, which is connected to an outer wall of the Rotor blade adjoins. The outer wall of the rotor blade has at least one opening in which a porous water-permeable Material is arranged and closes the opening. at The invention is on the outside the leaf no opening present, at the noise could arise. hereby The aperture can be chosen in a suitable size to sufficient Dissipate water. The water gets through the porous Material transported out of the interior of the rotor blade.
In einer bevorzugten Ausgestaltung schließt das poröse Material bündig mit der Oberfläche der Außenwand des Rotorblatts ab. Abgesehen von dem Umstand, daß das Material eine poröse Oberfläche besitzt, ändern sich die Strömungseigenschaften des Rotorblatts nicht wesentlich, mitunter kann sogar die Geräuschbildung vermindert werden.In In a preferred embodiment, the porous material is flush with the surface the outer wall of the rotor blade. Apart from the fact that the material a porous one Surface possesses change the flow characteristics the rotor blade is not essential, sometimes even the noise be reduced.
Zweckmäßigerweise ist die Durchbrechung im Bereich der Blattspitze angeordnet, da das Wasser durch die Fliehkraft hierhin bei dem sich drehenden Rotorblatt gedrückt wird. Vorzugsweise befindet sich die Durchbrechung in dem freien Ende der Blattspitze, also dem am weitesten von der Blattwurzel entfernt liegenden Punkt.Conveniently, the aperture is located in the area of the blade tip, since the water here by the centrifugal force at the rotating rotor blade depressed becomes. Preferably, the opening is in the free End of the blade tip, the furthest from the blade root lying point.
Bevorzugt ist zusätzlich mindestens eine Durchbrechung auf der Saugseite des Rotorblatts vorgesehen. Alternativ ist es auch möglich die Durchbrechung auf einer Seite des Rotorblatts vorzusehen und auf eine Durchbrechung im Bereich der Blattspitze zu verzichten. Ferner kann die gesamte Blattpitze aus dem porösen Material bestehen.Prefers is additional provided at least one opening on the suction side of the rotor blade. Alternatively, it is also possible to provide the opening on one side of the rotor blade and to dispense with an opening in the area of the blade tip. Further, the entire blade tip may be made of the porous material.
Zweckmäßigerweise ist der Hohlraum im Bereich der Durchbrechung mit einer verschließbaren Zugriffsöffnung versehen. Die Zugriffsöffnung erlaubt es, bei Wartungsarbeiten in den Rotorblattinnenraum einzugreifen. Ferner ist bevorzugt ein Siebelement in dem Hohlraum nahe der Zugriffsöffnung angeordnet, wobei das Siebelement eine quer zur Längsrichtung des Rotorblatts stehende Auffangfläche für die oben genannten Schmutzpartikel besitzt.Conveniently, the cavity is provided in the region of the opening with a closable access opening. The access opening allows intervention in the rotor blade interior during maintenance work. Furthermore, a sieve element is preferably arranged in the cavity near the access opening, wherein the sieve a transverse to the longitudinal direction of Rotor blade standing collecting surface for the owns above-mentioned dirt particles.
In einer bevorzugten Ausgestaltung, zur Verhinderung des Zusetzens des porösen Materials, hat es sich als zweckmäßig erwiesen, wenn das poröse Material in den Hohlraum vorsteht und auf diese Weise eine große Innenfläche besitzt.In a preferred embodiment, to prevent clogging of the porous one Materials, it has proved to be useful when the porous material protrudes into the cavity and thus has a large inner surface.
Als zweckmäßig für das poröse Material hat es sich erwiesen, einen Aluminiumschaum und/oder Edelstahlhohlkugeln vorzusehen, die durch ein kunststoffbasiertes Bindemittel zusammengehalten werden. Alternativ kann poröses Material aus gesintertem Kunstostoffmaterial oder andere poröse Kunststoffmaterialien verwendet werden.As it has proven useful for the porous material, an aluminum foam and / or To provide hollow stainless steel balls, which are held together by a plastic-based binder. Alternatively, porous material of sintered plastic material or other porous plastic materials may be used.
Die Erfindung wird anhand der Figuren nachfolgend näher erläutert.The The invention will be explained in more detail below with reference to the figures.
Es zeigt:It shows:
Um
ein Zusetzen des porösen
Materials zu verhindern, können
verschiedene Ansätze
gewählt werden.
Bei einem ersten Ansatz wird beispielsweise eine Handklappe in der
Rotorspitze vorgesehen, um bei Wartungsarbeiten in die Flügelspitze
eingreifen zu können,
damit das poröse
Material auf der Innenseite gereinigt werden kann und Schmutzreste
entfernt werden können.
In einem zweiten Ansatz kann das poröse Material
Claims (14)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004028916A DE102004028916A1 (en) | 2004-06-15 | 2004-06-15 | Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade |
EP05012630A EP1607624A3 (en) | 2004-06-15 | 2005-06-10 | Turbine blade for a wind turbine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004028916A DE102004028916A1 (en) | 2004-06-15 | 2004-06-15 | Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004028916A1 true DE102004028916A1 (en) | 2006-01-12 |
Family
ID=35501667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102004028916A Ceased DE102004028916A1 (en) | 2004-06-15 | 2004-06-15 | Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102004028916A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005019905A1 (en) * | 2005-04-29 | 2006-11-02 | Nordex Energy Gmbh | Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade |
DE102010011275A1 (en) * | 2010-03-13 | 2011-09-15 | Kenersys Gmbh | Rotor blade drainage |
DE102012015353A1 (en) * | 2012-08-06 | 2014-02-06 | Carl Von Ossietzky Universität Oldenburg | Rotor blade and rotor blade tip |
DE102017110635A1 (en) * | 2017-05-16 | 2018-11-22 | Schütz GmbH & Co. KGaA | rotor blade |
-
2004
- 2004-06-15 DE DE102004028916A patent/DE102004028916A1/en not_active Ceased
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005019905A1 (en) * | 2005-04-29 | 2006-11-02 | Nordex Energy Gmbh | Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade |
DE102005019905B4 (en) * | 2005-04-29 | 2012-12-06 | Nordex Energy Gmbh | Rotor blade for a wind energy plant |
DE102010011275A1 (en) * | 2010-03-13 | 2011-09-15 | Kenersys Gmbh | Rotor blade drainage |
DE102010011275B4 (en) * | 2010-03-13 | 2012-04-26 | Kenersys Gmbh | Rotor blade drainage |
US9046078B2 (en) | 2010-03-13 | 2015-06-02 | Kenersys Gmbh | Rotor blade drain |
DE102012015353A1 (en) * | 2012-08-06 | 2014-02-06 | Carl Von Ossietzky Universität Oldenburg | Rotor blade and rotor blade tip |
DE102017110635A1 (en) * | 2017-05-16 | 2018-11-22 | Schütz GmbH & Co. KGaA | rotor blade |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1607624A2 (en) | Turbine blade for a wind turbine | |
EP2325478B1 (en) | Rotor blade with drainage drill hole | |
EP1607623B1 (en) | Rotor blade for wind turbine | |
DE4409000C2 (en) | protector | |
DE102005047959B4 (en) | Method for producing a bushing in a fiber composite material and rotor blade for a wind turbine with a bushing | |
EP1247910B1 (en) | Odour-trap for waterless urinal | |
WO2006039953A1 (en) | Rotor blade for a wind power system | |
EP2845530A1 (en) | Portable suction device for liquids or liquid/air mixtures | |
DE102008002983A1 (en) | Rotor wing drainage device for wind turbine | |
EP2212561B1 (en) | Housing for a radial compressor | |
DE1426836B2 (en) | Axial steam turbine | |
DE102008048617B9 (en) | Rotor blade for a wind energy plant with at least one drainage opening | |
DE102004028916A1 (en) | Rotor blade for power generating wind turbine has porous material on blade tip with regular structure or foam structure to allow drainage of condensation from inside hollow blade | |
EP1600676A1 (en) | Drain valve for condensation water | |
EP2880306B1 (en) | Rotor blade and rotor blade tip | |
DE10136161A1 (en) | Drain unit, for a sewage/rainwater drainage system, has openings in the base shrouded by raised projections, to allow the flow to pass over carrying particles while cleaner part-flows escape through the openings into a lower conduit | |
DE10252038B3 (en) | odor trap | |
DE2807197A1 (en) | DRILL HEAD OF A ROTARY IMPACT DRILL | |
EP2510854B1 (en) | Low-noise exhaust gas expulsion assembly | |
WO2006048055A1 (en) | Vane for a rotary pump | |
EP1529137A1 (en) | Plastic container for collecting rain water | |
DE102019113543A1 (en) | Vacuum cleaner for cleaning floor surfaces | |
DE102012019470B4 (en) | Dust bag with a suction opening with a collar and a closure device | |
DE715296C (en) | Internal chip tap for blind holes | |
EP1386530B1 (en) | Lawn mower |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
R016 | Response to examination communication | ||
R016 | Response to examination communication | ||
R002 | Refusal decision in examination/registration proceedings | ||
R003 | Refusal decision now final |
Effective date: 20121127 |