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Expired Canadian patentCanada

Serial core memory array

CA 1069210 A · Owner: Singer Company (The) · Inventors: Jager, Peter A.; Stein, Morris O.; Rathjen, J. Fred

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

A densely packed low weight low volume, minimum temperature gradient memory array comprising a bilateral printed circuit board having a plurality of ferrite cores arranged in columns and rows mounted on one side and a plurality of integrated circuit diode flat-packs mounted on the other side. A ground plane comprising a thin metallic layer isolates the core plane from the mounting and also serves as a means for maintaining a minimum temperature gradient across the core plane. A heat conductor removes unwanted heat from the array, and the connections to elements of the array are grouped to reduce wiring runs.

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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 January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJanuary 1, 1980
Term endedJanuary 1, 1997
Patent numberCA 1069210 A
Classification (IPC)G11C11/06 +1 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedJan 1, 1980Term endedJan 1, 1997

Sources & verification

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