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. 13, 1992
Filed:
Mar. 22, 1991
Applicant:
Inventors:
Earl B Allen, III, Pleasanton, CA (US);
Steven L Kaczeus, San Jose, CA (US);
Charles T Bobek, Lathrop, CA (US);
Assignee:
Conner Peripherals, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ; G01N / ;
U.S. Cl.
CPC ...
324205 ; 324262 ;
Abstract
A bipolar magnet as used in magnetic disk drives is characterized by measuring field strength of the magnet along a plurality of radii using a Hall effect sensor which is incrementally indexed across the magnet by a stepper motor. The gap field strength, pole transitions, and null zone can be determined from combinations of the measurements along the plurality of radii.