Thin-film storage disk and method
CA 1261465 A · Owner: Xidex Corporation · Inventors: Eltoukhy, Atef H.; Price, Rick C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A method of producing a thin-film magnetic disk having high coercivity and magnetic remanence good loop, squareness, and low fluctuation in peak-to-peak recording signal amplitude over an entire circular recording path. The novel aspects of the method which contribute to the performance characteristics of the disk are (a) layering a 300-1,000 .ANG. magnetic film containing between about 70-88% cobalt 10-28% nickel, and 2-12% chromium over a 1,000-4,000 .ANG. chromium underlayer; (b) forming the film and underlayer under sputtering deposition conditions which prevent low-angle asymmetrical sputtering; and (c) shielding the disk substrate during sputtering in a manner which produces …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.