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. 18, 2003
Filed:
Jan. 31, 2001
Applicant:
Inventors:
Masashi Tagomori, Tokyo, JP;
Takashi Enomoto, Tokyo, JP;
Tsuyoshi Tomita, Tokyo, JP;
Hiroyuki Kato, Tokyo, JP;
Assignee:
Ebara Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F03B 1/506 ;
U.S. Cl.
CPC ...
F03B 1/506 ;
Abstract
A vortex prevention apparatus is combined with a pump, and prevents an air entrained vortex or a submerged vortex from being produced when water in the pump pit is pumped up by a pump. A suction member is disposed in an open water channel and has a suction port. An auxiliary flow-path forming structure is disposed substantially concentrically around the suction member with a gap defined between the auxiliary flow-path forming structure and an outer circumferential surface of the suction member.