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Expired Canadian patentCanada

Magnetic transducer head structure

CA 1284839 C · Owner: Conner Peripherals, Inc. · Inventors: Bolt, Michael L.; Sokolik, Edmund L.

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

magnetic core structure for a transducer head particularly adapted for use in digital data storage devices, comprising: magnetic core elements formed from magnetic material and defining a magnetic circuit said, circuit having at least one gap where magnetic flux in such circuit may access magnetically-recordable data storage media; moans defining a first magnetic pole structure for said circuit at one side of said gap, and means defining a second magnetic pole structure for said circuit at the other side of said gap, generally opposite said first pole structure: at least one of said magnetic pole structures having a laminar structure comprising at least one medial strata and at least one …

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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 June 11, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 2, 1987
GrantedJune 11, 1991
Term endedJune 11, 2008
Patent numberCA 1284839 C
Classification (IPC)G11B5/26 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedOct 2, 1987Patent grantedJune 11, 1991Term endedJune 11, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.