Diaphragm-type vacuum pump device
US4743169A · kind A · utility
20Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1987 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Jun 2, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B45/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A diaphragm-type vacuum pump device which includes a diaphragm, a pumping chamber the volume of which is changed by reciprocating motion of the diaphragm, a check valve for drawing air into the pumping chamber, a check valve for discharging air from the pumping chamber and an orifice or relief valve disposed in the pumping chamber so that the pumping chamber communicates with atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.