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Expired Canadian patentCanada

Crystalline rare earth alkaline earth copper oxide thick film conductor

CA 1305259 C · Owner: Mir, Jose M. · Inventors: Carnall, Edward Jr.; Strom, Laurie A.; Mir, Jose M.

CIPO record

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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 July 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 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
GrantedJuly 14, 1992
Term endedJuly 14, 2009
Patent numberCA 1305259 C
Classification (IPC)H05K1/02 +1 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedJune 6, 1988Patent grantedJuly 14, 1992Term endedJuly 14, 2009

Sources & verification

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