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. 20, 1979
Filed:
May. 09, 1977
Applicant:
Inventors:
Earl R Johnson, Tulsa, OK (US);
Lesley G Watkins, Tulsa, OK (US);
Assignee:
Loffland Brothers Company, Tulsa, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60T / ;
U.S. Cl.
CPC ...
188134 ; 175203 ;
Abstract
A disc-type brake apparatus adapted for installation in combination with the drawworks of a well bore drilling operation for automatically sensing any reverse torque situation in the drill pipe and quickly set the brake for precluding transmission of any reverse torque to the rotary table drive and clutch mechanism therefor.