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. 03, 2000
Filed:
May. 18, 1998
Applicant:
Inventor:
Kiyozumi Fukui, Tokyo, JP;
Assignee:
T. D. Engineering Co., Ltd., Fuwa-gun, JP;
Primary Examiner:
Int. Cl.
CPC ...
F01C / ;
U.S. Cl.
CPC ...
418 83 ; 4182011 ;
Abstract
A positive displacement pump is provided which is high both in reliability and in durability being durable in a continuous operation for a long period of time with the suction side of the pump temperature-controlled. In the positive displacement pump, rotors (21, 22) are accommodated in a pump housing (10) to form a plurality of operating chambers (31, 32), in such a manner that the operating chambers (31, 32) are increased on the suction side and decreased on the discharge side. A temperature control system (40) for controlling the temperature (12) of the suction inlet (12) of the pump is provided.