Initialization circuitry for magnetic recording system
CA 1066407 A · Owner: International Business Machines Corporation · Inventors: Hanson, Charles C.; King, Francis K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A magnetic disk particularly of the thin, flexible type has a magnetic head traversing the disk in order to come into registry with various concentric tracks on the disk. An electric motor of the stepping type is mechanically connected with the head for so moving the head, and a "present track number" counter is so electrically connected with the stepping motor as to keep track of the particular magnetic track on which the head is located. On a certain contingency such as a, cessation of power to the system the circuitry includes, components so connected as to cause the stepping motor to move the magnetic head to an outer limit on the disk outwardly of a …
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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 November 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 13, 1996.
- 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.