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:
Aug. 18, 1987
Filed:
Dec. 06, 1985
Applicant:
Inventor:
John B Czirr, Mapleton, UT (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
73 38 ; 73 407 ;
Abstract
Mine roof competency is determined by injecting a pressurized gas into a borehole drilled in the roof of the mine and measuring the rate of pressure loss. A high rate of pressure loss is indicative of a dangerous mine roof. A tracer gas may also be injected into the borehole to determine the extent of cracks in the roof if a dangerous condition has been determined.