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:
Oct. 20, 1981
Filed:
May. 05, 1980
Donald W Blincow, Claremont, CA (US);
Kevin H Cassedy, Laguna Beach, CA (US);
Samuel C Dominey, Jr, Glendora, CA (US);
Tyco Laboratories, Exeter, NH (US);
Abstract
Apparatus for measuring pressure on a well drilling bit which bit is connected to the drilling platform at the surface by a string of drill pipe, typically in a slant drilling configuration. The apparatus is inserted in the drill string and includes first and second sections of drill pipe with telescoping ends and a spring positioned therebetween urging one section away from the other. A radioactive source is mounted in one of the sections and a probe carrying a radioactive detector is positioned within the drill pipe, with a window in the other section of pipe providing a radiation path between the source and detector. Pressure on the drill bit varies the compression force on the spring permitting one section of pipe to move relative to the other and thereby vary the position of the window in the path between the radiation source and detector. The output of the detector varies as a function of window position and hence as a function of pressure on the drilling bit. The detector output is calibrated in pressure and may be displayed analog or digital as desired.