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. 21, 1992
Filed:
May. 04, 1990
Applicant:
Inventors:
Jerry E Frease, Lexington, KY (US);
John C Stankus, Canonsburg, PA (US);
Eugene H Stewart, Pittsburgh, PA (US);
Glen S Grissinger, Hollidaysburg, PA (US);
Assignee:
Jennmar Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
4052596 ; 4052595 ;
Abstract
The mine roof anchor includes a roof bolt assembly with an expansion shell assembly secured at the end of the bolt inserted into the bore hole. The expansion shell assembly includes a friction reducing means to increase the horizontal force on the leaves and the bolt assembly includes an adjustable resin retaining washer to compress the resin in the bore hole.