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:
Mar. 22, 1977
Filed:
Oct. 16, 1975
Applicant:
Inventors:
Walter K Weiler, Diez, DT;
Rudolf C Passavant, Aarbergen, DT;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E02D / ;
U.S. Cl.
CPC ...
404 25 ;
Abstract
A cover for manhole structures embodying a metal portion constructed of high strength material and assembled to provide maximum strength with a minimum of weight. A concrete portion is carried by the metal portion with the weight of the concrete portion being so proportioned relative to the weight of the metal portion that the combined weight thereof provides a manhole cover of a predetermined minimum weight.