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:
Apr. 19, 1977
Filed:
Dec. 08, 1975
Applicant:
Inventor:
Billy Walton McArthur, Wallis, TX (US);
Assignee:
Sperry-Sun Well Surveying Company, Sugar Land, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
73151 ; 73389 ; 73395 ;
Abstract
Borehole pressure is measured with an open-ended chamber positioned in the borehole and in fluid communication with a surface pressure source through a microtube. The chamber contains a ball float that seats in the upper end of the chamber to seal the microtube to entry of borehole fluids. The ball is made of a material having a density greater than that of the borehole fluids in order that the float can withstand high pressures. Partial support to compensate for the high density material of the float is provided by a spring attached between the chamber and the float ball.