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:
Dec. 22, 1998
Filed:
May. 27, 1997
Applicant:
Inventors:
John C Stankus, Canonsburg, PA (US);
Frank Calandra, Jr, Pittsburgh, PA (US);
Michael Cokus, Sarver, PA (US);
Ray W Goetz, Skaneateles, NY (US);
Assignee:
Jennmar Corporation, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C22C / ; E21D / ;
U.S. Cl.
CPC ...
420127 ; 420 93 ; 420120 ; 148320 ; 148332 ; 4052541 ;
Abstract
A steel alloy having 0.44-0.52 wt. % C, 1.1-1.6 wt. % Mn, 0.15-0.35 wt. % Si, a maximum of 0.04 wt. % P, a maximum of 0.05 wt. % S, a maximum of 0.45 wt. % Cu and 0.06-0.09 wt. % V. A No. 5 mine roof bolt formed from the steel alloy has a minimum yield strength of 90,000 psi. A mine roof bolt having a cross-sectional diameter of 7/8 inch or 1 inch and formed from the steel alloy has a minimum yield strength of 100,000 psi.