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Expired Canadian patentCanada

Output buffer circuit

CA 1259136 A · Owner: Sony Corporation · Inventors: Watanabe, Kazuo; Sato, Yoshinori

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

In an output buffer circuit for a memory including complementarily-connected P-channel and Nchannel MOS transistors, a voltage is induced across the lead inductance whenever the load capacitance is charged or discharged through the lead inductance during the switching operation of the buffer circuit. This induced voltage changes the ground level or the supply voltage level, and results in a problem such that data signals read from the memory are distorted. To overcome this problem one of the two MOS, transistors through which an electric charge is charged or discharged is divided into two MOS transistors of a small size, and the data signal is applied to one of the divided MOS transistor …

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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 5, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 5, 2006.
  • 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 9, 1986
GrantedSeptember 5, 1989
Term endedSeptember 5, 2006
Patent numberCA 1259136 A
Classification (IPC)G11C7/00 +2 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedJuly 9, 1986Patent grantedSep 5, 1989Term endedSep 5, 2006

Sources & verification

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