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Expired Canadian patentCanada

Two color write-through direct-viewing storage tube

CA 1161963 A · Owner: Tektronix, Inc. · Inventors: Mcteague, Gerald E.

CIPO record

Overview

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

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Abstract From the Canadian patent

Abstract of the Disclosure, Two color write-through information displayed by a direct-viewing bistable storage tube is achieved by admixing particles of a storage phosphor with surface-killed particles of a different phosphor to form a dielectric layer on a conductive layer having an array of collector electrode members. The collector electrode members are formed from surface-killed conductive phosphor particles. The storage phosphor and surface-killed phosphors operate at different voltage levels to simultaneously display storage and write-through information in three different colors.

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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 February 7, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 7, 2001.
  • 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 14, 1980
GrantedFebruary 7, 1984
Term endedFebruary 7, 2001
Patent numberCA 1161963 A
Classification (IPC)H01J31/18 +2 more

Timeline

Timeline From CIPO dates

1981198419871990199319961999Application filedJuly 14, 1980Patent grantedFeb 7, 1984Term endedFeb 7, 2001

Sources & verification

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