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. 09, 1993
Filed:
Oct. 12, 1990
Applicant:
Inventors:
Harold M Bowman, Fairview Park, OH (US);
George T Fuller, Chagrin Falls, OH (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E02D / ;
U.S. Cl.
CPC ...
404 26 ;
Abstract
The grip of the collar element of an existing circular manhole cover-supporting structure, such as a circular manhole frame, on a split-ring style expansion-joint-fitted manhole cover support inserted into, surrounded by, and forced by expansion against said collar element is improved by having selective stiffener means disposed in a sector of the cover support that is generally opposite to the expansion joint thereof, the stiffener means suppressing the tendency of the corresponding sector of the base ring to pull away from the collar element.