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Expired Canadian patentCanada

Active dynamic memory cell

CA 1322250 C · Owner: Lancaster, Loren Thomas · Inventors: Lancaster, Loren Thomas

CIPO record

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Abstract From the Canadian patent

Abstract A dynamic memory cell comprises a storage transistor and an access transistor. The gate of the storage transistor is utilized as a storage capacitor electrode, and is connected to its source by a high resistance resistor. The drain of the storage transistor is connected to a source of electrical potential (e.g. Vcc). The access transistor connects the source of the storage transistor to a bit line. This arrangement multiplies the effective capacitance of tile gate storage capacitor reducing the area required and hence making the structure more compact than a typical inactive (one transistor) DRAM cell. In a preferred embodiment the, resistor is formed to overlie the storage …

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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 September 14, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 14, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 10, 1988
GrantedSeptember 14, 1993
Term endedSeptember 14, 2010
Patent numberCA 1322250 C
Classification (IPC)G11C11/40 +2 more

Timeline

Timeline From CIPO dates

19891992199519982001200420072010Application filedAug 10, 1988Patent grantedSep 14, 1993Term endedSep 14, 2010

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