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:
Jan. 03, 1995
Filed:
Oct. 15, 1992
Applicant:
Inventors:
Michael E Lewis, Santa Rosa, CA (US);
Richard C Lewis, Santa Rosa, CA (US);
Rodney E Schapel, Reno, NV (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E02A / ;
U.S. Cl.
CPC ...
404 25 ; 52 19 ;
Abstract
The improved manhole cover of this invention provides a strong yet lightweight access cover structure made from a series of radially staggered ply layers bonded above and below a homogenous frusto-conical core portion with resin, each ply layer made from an array of radially staggered unidirectional fiber tape.