Patent assignee · FR · COMPANY

PFEIFFER VACUUM

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91Patents
62Active
91Granted
51Portfolio score

Filing activity: Aug 5, 1997 → Nov 15, 2022 · 14 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US5893702A Gas friction pump Mechanical Engineering; Lighting; Heating 62 Expired
US6446651B1 Multi-chamber vacuum system and a method of operating the same Emerging Cross-Sectional Technologies 13 Expired
US6030181A Vacuum apparatus and a method of controlling a suction speed thereof Mechanical Engineering; Lighting; Heating 10 Expired
US8123412B2 Vacuum pump with a bearing cage having a threaded groove Mechanical Engineering; Lighting; Heating 9 Active
US6461123B1 Turbomolecular pump Mechanical Engineering; Lighting; Heating 9 Expired
US6409477B1 Vacuum pump Mechanical Engineering; Lighting; Heating 7 Expired
US7828512B2 Arrangement for supporting a shaft of a vacuum pump and a vacuum pump with such an arrangement Mechanical Engineering; Lighting; Heating 7 Active
US8651838B2 Vacuum pump with control unit Mechanical Engineering; Lighting; Heating 7 Active
US6071085A Gas ballast system for a multi-stage positive displacement pump Mechanical Engineering; Lighting; Heating 5 Expired
US6658920B2 Leak detector pump Physics 5 Expired
US6368082B1 Vacuum pump with rotor supporting gas bearings Mechanical Engineering; Lighting; Heating 5 Expired
US6824357B2 Turbomolecular pump Mechanical Engineering; Lighting; Heating 5 Expired
US5927940A Double-flow gas friction pump Mechanical Engineering; Lighting; Heating 4 Expired
US9887604B2 Apparatus for kinetic energy storage having a flywheel with pump-active surfaces Emerging Cross-Sectional Technologies 4 Active
US6464451B1 Vacuum pump Mechanical Engineering; Lighting; Heating 4 Expired
US5910695A Damping device for a magnetically supported rotor Mechanical Engineering; Lighting; Heating 4 Expired
US6241490A Multirotor vacuum pump Mechanical Engineering; Lighting; Heating 4 Expired
US8202005B2 Bearing module for a vacuum pump Mechanical Engineering; Lighting; Heating 4 Active
US9745978B2 Housing for a rotary vane pump Mechanical Engineering; Lighting; Heating 4 Active
US6524060B2 Gas friction pump Mechanical Engineering; Lighting; Heating 4 Expired
US7226276B2 Multi-stage reciprocating vacuum pump and method of operating the same Mechanical Engineering; Lighting; Heating 3 Expired
US7059828B2 Gas friction pump Mechanical Engineering; Lighting; Heating 3 Expired
US6454525B2 Turbomolecular pump Mechanical Engineering; Lighting; Heating 3 Expired
US7378815B2 Speed monitoring device Emerging Cross-Sectional Technologies 3 Active
US7367429B2 Device for feeding oil to a bearing seat of a rotatable shaft Mechanical Engineering; Lighting; Heating 3 Expired

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.