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. 05, 1977
Filed:
Oct. 23, 1975
Chudleigh B Cochran, Houston, TX (US);
Brown Oil Tools, Inc., Houston, TX (US);
Abstract
A well tool comprising: a tubular housing adapted for fluid communicable connection with the lower end of a pipe string; a piston assembly carried by the housing for relative axial movement therein from a first to a second terminal position in response to fluid pressure communicated through the pipe string to a first pressure area on the piston assembly; a valve assembly carried by the housing and movable from a closed position to an opened position, in response to predetermined axial movement of the piston assembly, to permit the pipe string fluid pressure to be communicated to a second pressure area on the piston assembly opposing the first pressure area and forcing the piston assembly to return to its first terminal position; and a working member carried by the housing for movement in response to reciprocal movement of the piston assembly.