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Douglas W Crandell DeceasedTracy, CA

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Known as:
Douglas Jill Crandell Doug W Crandell
Related to:
Arthur J Crandell 88

Douglas Crandell Phones & Addresses

Tracy, CA

Santa Clara, CA

Fremont, CA

Milpitas, CA

Poughkeepsie, NY

Broomfield, CO

Morgan Hill, CA

San Joaquin, CA

5812 Northland Ter, Fremont, CA 94555 (530) 945-4454

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Mentions for Douglas W Crandell

Publications & IP owners

Us Patents

Method Of Grinding Thin-Film Magnetic Heads Using Optical Grinding Markers

US Patent:
5579717, Dec 3, 1996
Filed:
Oct 13, 1994
Appl. No.:
8/324424
Inventors:
Douglas W. Crandell - Morgan Hill CA
Edward H. P. Lee - San Jose CA
David J. Seagle - Morgan Hill CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G01D 2100
US Classification:
116208
Abstract:
According to the present grinding method, a plurality of optical markers are formed by photolithography such that the markers are embedded in a chiplet having a magnetic head. Markers are preferably in the shape of a bar having predetermined height, width and length and are spaced from each other by a predetermined distance where one end of the bars are sequentially offset from each other by a predetermined amount. During coarse grinding of the magnetic head as the magnetic head surface material is ground away, the end-face of the bars, one at a time, become visible. The closer the grinding surface approaches the desired inductive throat or MR element height, more end-faces become visible. Coarse grinding continues until a predetermined number of end-faces become visible at which point the grinding process is terminated and the magnetic head is ready for the final lapping process.

Method Of Grinding Thin-Film Magnetic Heads Using Optical Grinding Markers

US Patent:
5655475, Aug 12, 1997
Filed:
Sep 9, 1996
Appl. No.:
8/709921
Inventors:
Douglas Warren Crandell - Morgan Hill CA
Edward Hin Pong Lee - San Jose CA
David John Seagle - Morgan Hill CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G01D 2100
US Classification:
116201
Abstract:
According to the present grinding method, a plurality of optical markers are formed by photolithography such that the markers are embedded in a chiplet having a magnetic head. Markers are preferably in the shape of a bar having predetermined height, width and length and are spaced from each other by a predetermined distance where one end of the bars are sequentially offset from each other by a predetermined amount. During coarse grinding of the magnetic head as the magnetic head surface material is ground away, the end-face of the bars, one at a time, become visible. The closer the grinding surface approaches the desired inductive throat or MR element height, more end-faces become visible. Coarse grinding continues until a predetermined number of end-faces become visible at which point the grinding process is terminated and the magnetic head is ready for the final lapping process.

Possible Relatives

Daniel D Crandell  Denise L Crandell  Derrick A Crandell  Donna Crandell  Edward R Crandell  Gary L Crandell  George C Crandell  Douglas J Johnston  Douglas P Stanford  Douglas R Stangl 

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