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:
Sep. 08, 1981
Filed:
Aug. 20, 1979
Applicant:
Inventors:
William F Krause, Houston, TX (US);
Edwin C Turner, Houston, TX (US);
Assignee:
Hydril Company, Los Angeles, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166322 ; 251 52 ; 251324 ;
Abstract
A subsurface safety valve having a flapper-like pivoting closure element that is moved to and from the open and closed positions by a reciprocating operator assembly. When moved to the open position, the closure element is pivoted out of the flow path to protect it from possible damage.