CARL HURTH MASCHINEN- UND ZAHNRADFABRIK GMBH & CO.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4878571 Shiftable friction clutch for gear drivesExpiredJul 09, 87Nov 07, 89[F16D]
4817772 Shiftable friction clutchExpiredNov 02, 87Apr 04, 89[F16D]
4748772 Apparatus for the precision working of the tooth system of bevel gearsExpiredJun 19, 87Jun 07, 88[B24B]
4739587 Rolling drive for a gear-grinding machineExpiredMay 02, 86Apr 26, 88[B24B]
4697527 Drive unit for a rail vehicleExpiredSep 22, 86Oct 06, 87[B61C]
4694617 Method for the precision working of the tooth system of bevel gearsExpiredFeb 21, 86Sep 22, 87[B24B]
4693231 Gearlike, abrasive precision working tool, a method for dressing of such a tool and a dressing tool for dressing the toolExpiredNov 19, 85Sep 15, 87[B24B]
4677962 Gearlike tool for dressing abrasive, gearlike, precision machining toolsExpiredApr 17, 86Jul 07, 87[B24B]
4625853 Apparatus for the transport of workpieces to and from a machine toolExpiredFeb 26, 85Dec 02, 86[B65G]
4610576 Single-tooth cutter for sloping the faces of the teeth of gearsExpiredJul 19, 84Sep 09, 86[B23F]
4519733 Method and apparatus for automatically exchanging a workpiece in a machine toolExpiredAug 04, 82May 28, 85[B23F]
4502822 Machine for the precision working of tooth surfaces of toothed workpiecesExpiredFeb 17, 83Mar 05, 85[B23F]
4477214 Machine for the precision working of the tooth surfaces on toothed workpiecesExpiredMay 26, 82Oct 16, 84[B23F]
4442935 Pallet magazineExpiredJul 08, 81Apr 17, 84[B65G]
4409904 Double-axle drive for railway trucks of railraod vehiclesExpiredApr 20, 81Oct 18, 83[B61C]
4384498 Spur gear planetary gearing with load balanceExpiredJul 08, 81May 24, 83[F16H]
4354846 Nonsteerable drive mechanism for a watercraftExpiredMar 30, 81Oct 19, 82[B63H]

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