Vacuum control valves
US4305569A · kind A · utility
6Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1980 |
| Grant date | Dec 15, 1981 |
| Priority date | — |
| Expiry date | Sep 2, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86638
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A vacuum control valve, comprising a wall having a vacuum supply port and a utilization port therein, a valve member movable along such wall, and means guiding the valve member for movement along a predetermined path along such wall, such valve member having a sealing member with sealing enclosure means for selectively producing communication between such ports, each of such ports comprising an opening with a tapered portion extending into such wall at the intersection between such opening and such wall to avoid the formation of any burr at such intersection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.