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. 31, 2006
Filed:
Jun. 29, 2004
Kouji Aizawa, Tokyo, JP;
Shigeru Kishimoto, Ibaraki, JP;
Kaname Takagi, Tokyo, JP;
Minoru Iwasaki, Tokyo, JP;
Tomohiko Tagawa, Ibaraki, JP;
Kouji Aizawa, Tokyo, JP;
Shigeru Kishimoto, Ibaraki, JP;
Kaname Takagi, Tokyo, JP;
Minoru Iwasaki, Tokyo, JP;
Tomohiko Tagawa, Ibaraki, JP;
Hitachi Industries Co., Ltd., Tokyo, JP;
Abstract
A drainage pump has a pump part in which blades mounted on a rotary shaft are arranged in a pump casing and an underwater bearing unit which uses pumped water mixed with hard particles as a lubricant and has a sliding bearing for journaling the rotary shaft. A portion of the rotary shaft journaled by the sliding bearing is formed of a cemented carbide material and a shaft journaling surface of the sliding bearing is formed of a thermoplastic resin material to be embedded with hard particles.