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:
Jul. 04, 2000
Filed:
Sep. 29, 1998
Applicant:
Inventor:
So Kuroiwa, Kanagawa-ken, JP;
Assignee:
Ebara Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D / ;
U.S. Cl.
CPC ...
4151721 ; 415113 ; 415230 ; 415231 ;
Abstract
A pump has an impeller, a casing defining a pump chamber around the impeller for receiving a fluid discharged from the impeller; and, a seal mechanism provided between the impeller and the casing to prevent a fluid from leaking from the pump chamber through an annular space formed between the casing and the impeller. The seal mechanism comprises an annular seal member for blocking the annular space leaving an annular gap between the impeller and the seal member. The annular seal member is movably supported so that the annular seal member is supported in a floating condition in the fluid therearound in operation.