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Expired Canadian patentCanada

Self-and diol reactive formaldehyde-free crosslinking monomers and their derived polymers

CA 1283907 C · Owner: Air Products And Chemicals, Inc. · Inventors: Dixon, Dale D.; Burgoyne, William F. Jr.; Pinschmidt, Robert K. Jr.

CIPO record

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Abstract From the Canadian patent

A compound represented by the following formula: wherein R is a C3-C24 olefinically unsaturated organic radical having functionality which renders the nitrogen atom electron deficient, the olefinic unsaturation functionality being polymerizable, R1 is hydrogen or a C1-C4 alkyl radical or, R and R1 together with the nitrogen atom can form an olefinically unsaturated 5 to 7-member ring which has functionality that renders the nitrogen atom electron deficient and the olefinic unsaturation functionality is polymerizable R2 and R3 are hydrogen, a C1-C4 alkyl or acyl radical or, R2 and R3 together are a C2-C4 alkylene group R4 is hydrogen or a C1-C4 alkyl, acyl, ester amide or, acid group, and, n …

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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 May 7, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 7, 2008.
  • 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 14, 1986
GrantedMay 7, 1991
Term endedMay 7, 2008
Patent numberCA 1283907 C
Classification (IPC)C07C233/20 +2 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedMarch 14, 1986Patent grantedMay 7, 1991Term endedMay 7, 2008

Sources & verification

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