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Expired Canadian patentCanada

High temperature superconductor and method of making same

CA 1338523 C · Owner: Sheng, Zhengzhi · Inventors: Hermann, Allen M.; Sheng, Zhengzhi

CIPO record

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Abstract From the Canadian patent

A high temperature superconducting system has the general composition T1-R-X-Y, wherein: R is a Group 2A element; X is a Group 1B element; and Y is a Group 6A element. Preferably the composition has the following formula T1-Ba-Cu-O. The high temperature superconductor of the present invention has a transition temperature of about 90 K with the probability of one phase superconducting at a temperature perhaps as high as 270 K. Processes for making the high temperature superconductor are also provided.

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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 August 20, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 13, 1989
GrantedAugust 20, 1996
Term endedAugust 20, 2013
Patent numberCA 1338523 C
Classification (IPC)H01L39/12 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJan 13, 1989Patent grantedAug 20, 1996Term endedAug 20, 2013

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