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:
Aug. 01, 1978
Filed:
Dec. 27, 1976
John Ditcher, Langhorne, PA (US);
A-Lok Corporation, Trenton, NJ (US);
Abstract
A gasket for resiliently supporting a sewer pipe in a manhole opening, while sealing the opening against fluid flow, which gasket is a molded annulus of elastomeric material having a peripheral flange of substantial width and thickness connected by a radially extending web to an inner concentric rib of greater width than said web, and adapted to be embedded in concrete to its radially inward face, said rib having an integral circular skirt extending inwardly therefrom in a non-radial direction, and united at its rim with a second circular skirt oriented thereto at a reverse angle, said second skirt merging throughout its periphery into an O-ring of slightly smaller diameter than the diameter of the sewer pipe it is adapted to surround.