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:
Aug. 22, 1978
Filed:
May. 09, 1977
Applicant:
Inventor:
Cicero C Brown, deceased, late of Houston, TX (US);
Assignee:
Brown Oil Tools, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137496 ; 137498 ; 137504 ; 1375195 ; 13753311 ; 13753315 ; 166329 ;
Abstract
A check valve assembly for use in a drill string to prevent reverse flow of drilling fluid through the string while permitting such fluid to be pumped downwardly through the well under normal conditions. The assembly includes: a valve body; a ball valve member, normally located out of the flow path in a side recess; a valve seat located above the valve member and means for controlling the rate of reverse flow of fluid required to move the valve member out of the side recess and against the valve seat.