Screw type vacuum pump
US4714418A · kind A · utility
18Cited by
9References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1985 |
| Grant date | Dec 22, 1987 |
| Priority date | — |
| Expiry date | Feb 13, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C18/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A screw vacuum pump including a plurality of casings and a pair of rotors defining a plurality of working chambers. The working chambers are constituted by working chambers whose volumes undergo a change as the rotors rotate, and working chambers whose volumes undergo substantially no change as the rotors rotate. The screw vacuum pump is capable of achieving pressure of 10.sup.-1 to 10.sup.-4 Torr or a low or medium vacuum by means of a single pump operating in a single stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.