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. 05, 1978
Filed:
Mar. 15, 1977
Applicant:
Inventors:
Loren B Sheldon, Houston, TX (US);
James R Tomashek, Wood Dale, IL (US);
Donald H Ward, Glen Ellyn, IL (US);
Assignee:
BJ-Hughes Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; G06F / ;
U.S. Cl.
CPC ...
364565 ; 214-25 ; 340 / ; 340670 ;
Abstract
A computer - controlled oil drilling rig is characterized by apparatus for comparing signals representative of the actual velocity and direction of travel of a traveling block with signals representative of predetermined minimum and maximum velocities of the traveling block and a signal representative of a predetermined direction of travel of the traveling block. Output signals are generated if the actual velocity signals are greater than the maximum velocity signal or less than the minimum velocity signal and if the direction of the traveling block deviates from the predetermined direction.