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:
Oct. 06, 2009
Filed:
Dec. 03, 2004
Applicants:
Jimmie R. Williamson, Jr., Carrollton, TX (US);
James D. Vick, Jr., Dallas, TX (US);
Abram Galindo, Dallas, TX (US);
Inventors:
Jimmie R. Williamson, Jr., Carrollton, TX (US);
James D. Vick, Jr., Dallas, TX (US);
Abram Galindo, Dallas, TX (US);
Assignee:
Halliburton Energy Services, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 34/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A safety valve with extension springs. In a described embodiment, a valve for use in a subterranean well includes a closure member having open and closed positions. A structure displaces to cause the closure member to displace between the open and closed positions. A biasing device has a length which decreases as the structure displaces to cause the closure member to displace toward the closed position.