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Expired Canadian patentCanada

D.c. stable semiconductor memory cell

CA 1060994 A · Owner: International Business Machines Corporation · Inventors: Askin, Haluk O.; Lee, James M.; Jacobson, Edward C.

CIPO record

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Abstract From the Canadian patent

D.C. STABLE SEMICONDUCTOR MEMORY CELL, Abstract of the Disclosure Disclosed is a field effect transistor (FET) memory array in which each of the cells forming the array comprises four FET's . The first and second of the four FET devices are cross-coupled while the third and fourth FET devices form loads for the cross coupled pair. D.C. stability is achieved by conditioning the load FET devices into partial conduction during the stand-by state of the memory cell.

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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 August 21, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 21, 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.
Filed—
GrantedAugust 21, 1979
Term endedAugust 21, 1996
Patent numberCA 1060994 A
Classification (IPC)G11C7/02 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedAug 21, 1979Term endedAug 21, 1996

Sources & verification

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