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:
May. 13, 1980
Filed:
Jun. 23, 1978
Walter A Gunkel, San Antonio, TX (US);
Robert W Lybecker, San Antonio, TX (US);
Hughes Tool Company, Houston, TX (US);
Abstract
Numbers in binary form comprising apertures filled with non-magnetic material are formed in the outer periphery of drill pipe sections for identification purposes. The numbers are read by a sensor and recorded as the drill pipe sections are lowered into a well bore in order to keep track of the position of the pipe sections in the drill string and to obtain a cumulative record of the service time of each drill pipe section for the purpose of determining fatigue damage. The sensor comprises an encircling electrical coil which generates a magnetic field in the walls of the drill pipe sections as they are moved through the coil and a second electrical coil which is rotated around the drill pipe section in the vicinity of the encircling coil for detecting the magnetic field next to the filled encloding apertures of the identification numbers.