Assignee
PFEIFFER VAKUUMTECHNIK
DE·27 granted patents·591 citations·filing 1975–1991
Top patents by PatentIndex Score
27 records- 0194US4082376ABearing arrangementPFEIFFER VAKUUMTECHNIK·Filed 1975·Granted Apr 4, 1978·77 cites·20 claims
- 0289US4541772APump with magnetic bearingsPFEIFFER VAKUUMTECHNIK·Filed 1983·Granted Sep 17, 1985·39 cites·2 claims
- 0387US4320653AMethod of and apparatus for measuring the rate of leakPFEIFFER VAKUUMTECHNIK·Filed 1980·Granted Mar 23, 1982·47 cites·10 claims
- 0484US5166566AMagnetic bearings for a high speed rotary vacuum pumpPFEIFFER VAKUUMTECHNIK·Filed 1989·Granted Nov 24, 1992·44 cites·5 claims
- 0580US4520296AElectric motor drive arrangementPFEIFFER VAKUUMTECHNIK·Filed 1983·Granted May 28, 1985·43 cites·7 claims
- 0678US5193998ASealing arrangement for heat treatment apparatusPFEIFFER VAKUUMTECHNIK·Filed 1991·Granted Mar 16, 1993·30 cites·7 claims
- 0774US4424633AApparatus for heating and drying articlesPFEIFFER VAKUUMTECHNIK·Filed 1981·Granted Jan 10, 1984·29 cites·7 claims
- 0874US4111595ATurbomolecular pump with magnetic mountingPFEIFFER VAKUUMTECHNIK·Filed 1976·Granted Sep 5, 1978·26 cites·5 claims
- 0971US4784873AMethod of producing biological specimensPFEIFFER VAKUUMTECHNIK·Filed 1984·Granted Nov 15, 1988·25 cites·1 claims
- 1069US5088899APump with drive motorPFEIFFER VAKUUMTECHNIK·Filed 1990·Granted Feb 18, 1992·39 cites·4 claims
- 1165US4826394AVacuum pumpPFEIFFER VAKUUMTECHNIK·Filed 1988·Granted May 2, 1989·24 cites·6 claims
- 1263US4502832ATurbo-molecular pumpPFEIFFER VAKUUMTECHNIK·Filed 1983·Granted Mar 5, 1985·20 cites·11 claims
- 1362US4893985AMulti-stage molecular pumpPFEIFFER VAKUUMTECHNIK·Filed 1988·Granted Jan 16, 1990·24 cites·11 claims
- 1460US4423766AVacuum condensation apparatusPFEIFFER VAKUUMTECHNIK·Filed 1981·Granted Jan 3, 1984·20 cites·3 claims
- 1555US5070264APosition sensorPFEIFFER VAKUUMTECHNIK·Filed 1990·Granted Dec 3, 1991·21 cites·8 claims
- 1654US4770574ADiscs with bladesPFEIFFER VAKUUMTECHNIK·Filed 1987·Granted Sep 13, 1988·14 cites·8 claims
- 1750US4850576AHeat treatment of materialsPFEIFFER VAKUUMTECHNIK·Filed 1987·Granted Jul 25, 1989·10 cites·2 claims
- 1847US4193742AVacuum pump assembly with built-in shutoff valvePFEIFFER VAKUUMTECHNIK·Filed 1978·Granted Mar 18, 1980·9 cites·6 claims
- 1946US5193100AApparatus for detecting gaseous discharge in vacuum furnacesPFEIFFER VAKUUMTECHNIK·Filed 1991·Granted Mar 9, 1993·7 cites·9 claims
- 2042US4708190ATreating metals and/or metallic compoundsPFEIFFER VAKUUMTECHNIK·Filed 1986·Granted Nov 24, 1987·5 cites·8 claims
- 2141US4465442ARotary piston pump with pressure equalization chambers for the shaft split sealsPFEIFFER VAKUUMTECHNIK·Filed 1981·Granted Aug 14, 1984·10 cites·9 claims
- 2236US4832564APumpsPFEIFFER VAKUUMTECHNIK·Filed 1988·Granted May 23, 1989·8 cites·5 claims
- 2331US4652214ASeal arrangement for an oil-sealed rotary vacuum pumpPFEIFFER VAKUUMTECHNIK·Filed 1985·Granted Mar 24, 1987·7 cites·8 claims
- 2429US5017106APump for conveying gases and providing a differential pressurePFEIFFER VAKUUMTECHNIK·Filed 1990·Granted May 21, 1991·4 cites·6 claims
- 2528US4818223AApparatus for treating workpieces with hot gases including gas distributing meansPFEIFFER VAKUUMTECHNIK·Filed 1987·Granted Apr 4, 1989·6 cites·10 claims
- 2625US4508494ATwo stage rotary vane pumpPFEIFFER VAKUUMTECHNIK·Filed 1982·Granted Apr 2, 1985·2 cites·2 claims
- 2720US5054748AMulti-chamber vacuum installationPFEIFFER VAKUUMTECHNIK·Filed 1990·Granted Oct 8, 1991·1 cites·3 claims
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