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. 08, 2005
Filed:
Apr. 30, 2003
George Ellis Devaull, Iii, Houston, TX (US);
Donald Lee Tharpe, Katy, TX (US);
George Ellis DeVaull, III, Houston, TX (US);
Donald Lee Tharpe, Katy, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
An apparatus and a process for injecting fluids while prevents backflow are provided. The apparatus comprises a) a hollow core pipe with an open end and a closed end, and containing exit ports in the peripheral wall that are closed when there is no, or low fluid pressure; b) a stationary valve seat, fitted in the pipe; c) an axial sliding plug, disposed to be received in the valve seat where there is no or low fluid pressure thereby closing the exit ports wherein an increase in fluid pressure causes the plug to slide toward the closed end and the opening of the exit ports; and d) a spring held in place between the slidable plug and the closed end, the spring continuously urging the plug in a direction away from the closed end.