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Expired Canadian patentCanada

Hydroxyl-functional disiloxanes and polysiloxane oligomers

CA 1337908 C · Owner: Riffle, Judy S. · Inventors: Yilgor, Iskender; Riffle, Judy S.

CIPO record

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Abstract From the Canadian patent

Hydroxyl-functional disiloxanes and hydroxyl-functional polysiloxane oligomers are provided which contain hydroxyl groups bound to the silicon via Si-C bonds. These compounds may be crosslinked to form polysiloxane networks having improved mechanical strength or reacted to form linear, siloxane containing block copolymers.

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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 January 9, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 9, 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.
FiledJune 5, 1987
GrantedJanuary 9, 1996
Term endedJanuary 9, 2013
Patent numberCA 1337908 C
Classification (IPC)C07F7/08 +2 more

Timeline

Timeline From CIPO dates

198819911994199720002003200620092012Application filedJune 5, 1987Patent grantedJan 9, 1996Term endedJan 9, 2013

Sources & verification

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