Sewer relief valve
USRE32870E · kind E · reissue
7Cited by
21References
28Claims
0Family size
Inventors
Key dates
| Filing date | Oct 9, 1986 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Oct 9, 2006 |
Classification
- Technology area (CPC —)General
Abstract
An improved sewer relief valve which is vandal-proof and automatically opens responsive to a back flow of sewage and drain water within a plumbing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.