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:
Apr. 03, 2001
Filed:
Jul. 08, 1999
Applicant:
Inventor:
Phillip V. Cortez, Concord, CA (US);
Assignee:
Tuthill Pump Group, a subsidiary of Tuthill Corporation, Concord, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F03C 2/00 ;
U.S. Cl.
CPC ...
F03C 2/00 ;
Abstract
Rotary pump apparatus includes a pump housing having a drive gear and a driven gear positioned in the interior of the housing. A fluid-flow passageway provides fluid to a volumetrically changing space located between meshing gear teeth to prevent the pressure in the space from dropping below the vapor pressure of the fluid.