Apparatus and method for improved pipe to manhole sealing
US4993722A · kind A · utility
16Cited by
19References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Sep 21, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L41/088
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus for sealably and flexibly joining together a pipe member and an enclosed body in a sewer system having a seal comprising an elastic sleeve with an annular cavity. The cavity contains a coagulant material that forms a cellular, viscous gel when activated with water. When the seal is properly positioned, water is pumped under pressure through a valve into the cavity to expand the elastic sleeve into sealing engagement with the pipe and the manhole. In time the water and coagulant material forms the gel that remains in the viscous state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.