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Expired Canadian patentCanada

Devices featuring silicone elastomers

CA 2015481 C · Owner: Filas, Robert William · Inventors: Johnson, Bertrand Harold; Wong, Ching-Ping; Filas, Robert William

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

Devices are described in which certain crosslinked silicone polymers are incorporated. These polymers have various functions such as encapsulating agents surface protective agents or agents to index match optical components (e.g. optical fiber, optical waveguide, etc.) to other optical devices or articles. The polymer is a vinyl-terminated dimethyldiphenylsiloxane copolymer crosslinked with tri-or tetrafunctional silanes in the presence of a platinum catalyst. The phenyl groupcontent of the crosslinked silicone copolymer is adjusted to change the index ofrefraction of the polymer to the optimum for the particular application contemplated. Polymer preparation procedures are described which …

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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

  • Filed April 26, 1990 and granted May 14, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2012.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 26, 1990
GrantedMay 14, 1996
Term endedApril 26, 2010
Patent numberCA 2015481 C
Classification (IPC)C08G77/20 +2 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedApril 26, 1990Patent grantedMay 14, 1996Term endedApril 26, 2010

Sources & verification

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