Sealing gasket for a roadway manhole
US4772154A · kind A · utility
40Cited by
7References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Sep 4, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A sealing gasket for an unlocked roadway manhole accessing a municipal sewage system is interposed between a cover 2 and a frame 1, and has an inverted L or hook-shaped cross-section including two spaced and parallel outwardly extending upper lips 18, 19 and two lower, oppositely extending lips 17, 20.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.