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. 06, 1992
Filed:
Sep. 21, 1990
Applicant:
Inventors:
Hirokazu Takii, Osaka, JP;
Tetsuo Oda, Osaka, JP;
Shinji Abe, Osaka, JP;
Kazuya Suzuki, Osaka, JP;
Hirotsugu Kusano, Osaka, JP;
Assignee:
Koyo Seiko Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ; F16C / ;
U.S. Cl.
CPC ...
277 80 ; 277 37 ; 277135 ; 384446 ;
Abstract
A ferrofluid seal apparatus comprises magnetic fluid holding or positing means for storing or retaining a magnetic fluid in a sealing arrangement wherein inner and outer elements are relatively rotated. The magnetic fluid holding means includes an arrangement for retaining the magnetic fluid which flows out from its original position.