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:
Jan. 30, 2001
Filed:
Jun. 11, 1999
Applicant:
Inventors:
Michael D. Kennedy, Boulder Creek, CA (US);
Alan Lyndon Grantz, Aptos, CA (US);
Assignee:
Seagate Technology LLC, Scotts Valley, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K 7/08 ; F16C 3/206 ;
U.S. Cl.
CPC ...
H02K 7/08 ; F16C 3/206 ;
Abstract
A fluid dynamic bearing usable in a spindle motor where the bearing is defined between two relative rotating surfaces which are open to the air at both ends, allowing the use of a fixed shaft. At one end of the shaft, at least one high volume, low stiffness seal is used, in combination with a low volume, high stiffness seal. The pressure differential between these two seals is balanced by one or more high stiffness, low volume seals spaced axially away along the shaft.