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:
Jan. 21, 1997
Filed:
Jul. 24, 1995
Applicant:
Inventors:
Glenn J Martin, Houma, LA (US);
Chuan C Teng, Houston, TX (US);
Assignee:
Houston Engineers, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175297 ; 166178 ;
Abstract
There is disclosed a double acting hydraulic jar of such construction as to permit it to be 'short cocked' during either an up or down jar, and further in which flow past a detent in metered in such a way as to permit lesser flow therepast during an upward jar than during a downward jar, whereby the rate of movement of the detent ring through a restriction, and thus the 'delay', may be essentially the same during both up and down jars.