Patent Yard Sign in
Expired Canadian patentCanada

Irreversible semiconductor switching element and semiconductor memory device utilizing the same

CA 1082809 A · Owner: Nippon Telegraph And Telephone Public Corporation · Inventors: Watanabe, Takashi; Tanimoto, Masafumi; Murota, Junichi

CIPO record

Overview

Drawings and full text

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

Open the CIPO record

Abstract From the Canadian patent

Specification, Title of the Invention, Irreversible Semiconductor Switching Element and Semiconductor, Memory Device Utilizing the Same Abstract of the Disclosure, The switching element comprised a high resistivity polycrystalline silicon resistor whose resistance irreversibly decreases to a small value at a threshold voltage when the voltage across the resistor reaches the threshold voltage. A semiconductor memory devise is constituted by using the switching element as a memory cell and, a semiconductor gate element for controlling the current flowing through the semiconductor switching element. The switching element has simple construction and can operate with low voltage and low current. …

Read the whole patent

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 July 29, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 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.
FiledNovember 30, 1976
GrantedJuly 29, 1980
Term endedJuly 29, 1997
Patent numberCA 1082809 A
Classification (IPC)G11C11/34 +2 more

Timeline

Timeline From CIPO dates

1977198019831986198919921995Application filedNov 30, 1976Patent grantedJuly 29, 1980Term endedJuly 29, 1997

Sources & verification

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