Drainage seal for sewage system
US4476603A · kind A · utility
4Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1983 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Jun 16, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F9/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
To facilitate cleanout of a sewer a guide member is located with a manhole to guide a cleanout tool into the sewer. The sewer is downwardly inclined adjacent the manhole so that the inlet enters at a location below the outlet and a predetermined level of liquid is maintained in the manhole. The guide member comprises a base with a pair of upstanding wings that project above the predetermined level to present a pair of guide members for the insertion of the cleanout tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.