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:
Mar. 28, 1989
Filed:
Jun. 16, 1988
Applicant:
Inventor:
Thomas C Burroughs, Houston, TX (US);
Assignee:
The Cavins Corporation, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166312 ; 166186 ; 166187 ; 166191 ;
Abstract
A washing tool (24) attached to the lower end of a pipe string (18) includes a mandrel (28) between upper and lower subs (30, 32). The mandrel (28) has opposed spaced end sections (54 56) connected with an intermediate section (58). Each end section (54, 56) has a fluid inflatable elastomeric packer (64) thereon inflatable at a relatively low fluid pressure, and intermediate section (58) has a leaf spring (86) over a port (84) which is opened by outward movement of the leaf spring (86) at a second higher predetermined fluid pressure within the pipe string (18).