Back flow valve
US4494345A · kind A · utility
22Cited by
4References
8Claims
0Family size
Inventor
Key dates
| Filing date | Aug 12, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Aug 12, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7374
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A sewer back flow valve having sensing means located at the top of the sewer line and an inflatable annular bladder responsive to a sensing means to permit passage of sewage through the annular bladder under normal water level conditions and operable to prevent back flow of sewage through the annular bladder under high water level conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.