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:
Nov. 07, 2000
Filed:
Sep. 08, 1998
Teruaki Akamatsu, Kyoto, JP;
Toshihiko Nojiri, Kanagawa, JP;
Takayoshi Ozaki, Shizuoka, JP;
Minoru Suzuki, Shizuoka, JP;
NTN Corporation, Osaka, JP;
Abstract
A centrifugal fluid pump assembly has a pump body and a controller. The pump body has a housing, a pump section having an impeller rotating inside the housing, an impeller rotational torque generating section having a motor for rotating the impeller and an impeller position control section. The impeller rotates without contacting the housing. The controller has an impeller-floating position control function for changing the floating position of the impeller inside the housing by using the impeller position control section, a function of measuring electric current for driving the motor and a fluid viscosity calculation function for calculating a viscosity of fluid by utilizing a variation amount of the motor-driving electric current obtained by changing the floating position of the impeller.