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Expired Canadian patentCanada

Conductive thick films and processes for film preparation

CA 1296955 C · Owner: Carnall, Edward, Jr. · Inventors: Ferranti, Steven A.; Carnall, Edward, Jr.; Mir, Jose M.

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Abstract From the Canadian patent

Abstract of the Disclosure, A process is disclosed of forming an electrical conductor on an insulative substrate by coating onto the substrate particles of metal-ligand compounds of each of rare earth, alkaline earth and, copper, where the ligands are chosen to be volatilizable. The particles are heated in the presence of oxygen to form an intermediate coating on the substrate, and the intermediate coating is converted to a crystalline, electrically conductive form. Either thick or thin films can be formed by the process, and in preferred forms the films can be superconducting at elevated temperatures.

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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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 6, 1988
GrantedMarch 10, 1992
Term endedMarch 10, 2009
Patent numberCA 1296955 C
Classification (IPC)H01L39/24 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedJune 6, 1988Patent grantedMarch 10, 1992Term endedMarch 10, 2009

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