The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 1991
Filed:
Sep. 21, 1989
Applicant:
Inventor:
William P Gundy, Milford, NH (US);
Assignee:
NPC, Inc., Milford, NH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277 343 ; 2772 / ; 277226 ;
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.