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:
Dec. 09, 1980
Filed:
May. 30, 1978
Applicant:
Inventors:
Jack D Lollis, Tulsa, OK (US);
David J Hicks, Tulsa, OK (US);
Assignee:
T. D. Williamson Inc., Tulsa, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ; G01M / ;
U.S. Cl.
CPC ...
138 90 ; 73 495 ; 285409 ;
Abstract
A pig trap closure is disclosed which includes a collar adapted to be attached to the end of a pipe, a door for opening and closing the end of the pipe, means for clamping the door to the collar and sealing means for preventing communication between the interior of the pipe and the atmosphere when the door is clamped to the collar. A testing valve is provided for indicating the presence of pressurized fluid in the pipe and means connects the testing valve to a handle used to unclamp the door for preventing movement of the handle until after the presence of pressurized fluid within the pipe has been checked by the testing valve.