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:
Jul. 20, 1976
Filed:
Aug. 30, 1974
Applicant:
Inventors:
Michael King Russell, Cheltenham, EN;
Anthony William Russell, Cheltenham, EN;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310-83 ; 7319 / ; 7319 / ; 175 40 ; 175 48 ; 310-87 ; 310-91 ; 310-85 ;
Abstract
The electrical power required to drive downhole drilling tools and/or measuring instruments is obtained using means responsive to turbulence in the mud flow past a unit forming part of the drill string. The responsive means may comprise a piezo-electric disc connected to rectifying and smoothing circuits whereby a D.C. output is obtained.