PFEIFFER VACUUM
🏢 View company profile →91Patents
62Active
91Granted
51Portfolio score
Filing activity: Aug 5, 1997 → Nov 15, 2022 · 14 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| 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.