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Expired Canadian patentCanada

Three-pole magnetic recording head

CA 1310411 C · Owner: Mallary, Michael L. · Inventors: Mallary, Michael L.

CIPO record

Overview

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

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Abstract From the Canadian patent

60412-1788, Abstract of the Disclosure Disclosed is a magnetic recording head which includes a read pole disposed between a pair of write poles spaced apart to form a gap therebetween. The read pole conducts flux to a flux sensor that is located away from the gap. The head can be utilized for both longitudinal and perpendicular recording and the readback function can be carried out by an inductive coil or flux sensing device such as a Hall sensor or an MR sensor. The recording head achieves high readback resolution high write field, gradients, and the capability for write wide-read narrow. The read pole and write poles are laminated structures.

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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 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 28, 1988
GrantedNovember 17, 1992
Term endedNovember 17, 2009
Patent numberCA 1310411 C
Classification (IPC)G11B5/31 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedJuly 28, 1988Patent grantedNov 17, 1992Term endedNov 17, 2009

Sources & verification

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