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. 16, 1979
Filed:
Jun. 14, 1977
Applicant:
Inventor:
Norman W Read, Dallas, TX (US);
Assignee:
Dresser Industries, Inc., Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166334 ; 251363 ;
Abstract
An oilwell tubing tester for the in-place pressure-testing of oilwell tubing strings for leaks, utilizes a flapper valve, a valve seat, a three-piece sealing mechanism, and a sliding J-mandrel located inside the tester housing in abutting relationship with the flapper valve.
Read, Norman. (1979). Oilwell tubing tester with trapped valve seal (U.S. Patent No. 4134455). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4134455
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile