Arthur Pfeiffer Vakuumtechnik Wetzlar GmbH

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F04D NON-POSITIVE-DISPLACEMENT PUMPS173

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5209631 Arrangement for flooding high speed vacuum pumpsJul 11, 91May 11, 93[F04D]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5193998 Sealing arrangement for heat treatment apparatusExpiredJun 05, 91Mar 16, 93[F23M]
5193100 Apparatus for detecting gaseous discharge in vacuum furnacesExpiredJun 21, 91Mar 09, 93[F27D]
5088899 Pump with drive motorExpiredNov 09, 90Feb 18, 92[F04B]
5070264 Position sensorExpiredSep 14, 90Dec 03, 91[H02K]
5054748 Multi-chamber vacuum installationExpiredOct 18, 90Oct 08, 91[C21C]
5017106 Pump for conveying gases and providing a differential pressureExpiredApr 11, 90May 21, 91[F04C]
4893985 Multi-stage molecular pumpExpiredAug 15, 88Jan 16, 90[F01D]
4850576 Heat treatment of materialsExpiredJun 18, 87Jul 25, 89[C21D]
4832564 PumpsExpiredJun 20, 88May 23, 89[F01D]
4826394 Vacuum pumpExpiredJan 22, 88May 02, 89[F01D]
4818223 Apparatus for treating workpieces with hot gases including gas distributing meansExpiredJun 18, 87Apr 04, 89[F27B]
4784873 Method of producing biological specimensExpiredApr 30, 84Nov 15, 88[A01N, A01G]
4770574 Discs with bladesExpiredMar 24, 87Sep 13, 88[B23C]
4708190 Treating metals and/or metallic compoundsExpiredJul 18, 86Nov 24, 87[B22D]
4652214 Seal arrangement for an oil-sealed rotary vacuum pumpExpiredFeb 23, 85Mar 24, 87[F04B]
4541772 Pump with magnetic bearingsExpiredOct 19, 83Sep 17, 85[F04D, F01D]
4520296 Electric motor drive arrangementExpiredMar 21, 83May 28, 85[H02K, H02P]
4508494 Two stage rotary vane pumpExpiredSep 28, 82Apr 02, 85[F04C]
4502832 Turbo-molecular pumpExpiredFeb 10, 83Mar 05, 85[F04D]
4465442 Rotary piston pump with pressure equalization chambers for the shaft split sealsExpiredDec 17, 81Aug 14, 84[F04C, F16J]

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