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Expired Canadian patentCanada

Electrically conductive curable liquid organopolysiloxane compositions

CA 1138187 A · Owner: Toray Silicone Company, Ltd. · Inventors: Shimizu, Koji; Sumimura, Shinichi

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

A curable liquid composition containing a liquid polyorganosiloxane and carbon black particles which are hollow-shell-shaped and which have a specific surface area of at least 900 m2/g. The composition cures to a product having excellent electrical conductivity.

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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 December 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 7, 1980
GrantedDecember 28, 1982
Term endedDecember 28, 1999
Patent numberCA 1138187 A
Classification (IPC)H01B1/24 +2 more

Timeline

Timeline From CIPO dates

1981198319851987198919911993199519971999Application filedMarch 7, 1980Patent grantedDec 28, 1982Term endedDec 28, 1999

Sources & verification

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