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:
Jul. 01, 1986
Filed:
Jul. 12, 1984
James D Gruenwald, Menomonee Falls, WI (US);
Clearwater Technologies, Inc., Menomonee Falls, WI (US);
Abstract
A rehabilitated manhole cover and method of producing the same. To rehabilitate the manhole cover for a sanitary sewer system, a removable plug is inserted in one of the vent holes in the cover, while a permanent seal is applied to the remaining vent holes. A pneumatic gasket is installed with an adhesive on the annular ledge in the manhole casting and the cover when installed rests on the ledge and compresses the gasket to provide a seal between the cover and the casting. To properly center the cover, holes are drilled in the peripheral edge of the cover and metal rivets installed within the holes. Each rivet is provided with an enlarged head which projects outwardly from the cover and can be spaced from the peripheral edge of the cover by shims or spacers to thereby maintain the peripheral edge of the cover is close proximity to the manhole casting. By removing the removable plug the cover can be removed from the manhole in a conventional manner by using a pick.