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:
Mar. 19, 2002
Filed:
Nov. 12, 1999
Applicant:
Inventor:
Dustin A. Cochran, Scotts Valley, CA (US);
Assignee:
Seagate Technology LLC, Scotts Valley, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25F 3/00 ;
U.S. Cl.
CPC ...
C25F 3/00 ;
Abstract
An apparatus and method are provided for electrochemically etching grooves in an inner surface of a hub to form at least one fluid dynamic bearing. The apparatus includes a cathode having an electrically conductive substrate with an outer surface that corresponds to the inner surface of the hub . The outer surface has raised lands corresponding to areas in which the grooves are to be formed in the inner surface of the hub . A layer of electrically insulating material covers the outer surface of the substrate between the raised lands to reduce etching of the inner surface of the hub in corresponding areas.