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Expired Canadian patentCanada

Ingestible amine functionalized and cross-linked homopolymers with hydrophobic backbone for the lowering of blood cholesterol

CA 2038852 C · Owner: Lowchol Scientific Inc. · Inventors: Brown, George Ronald; Wu, Gaoming; St. Pierre, Leon Edward

CIPO record

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Abstract From the Canadian patent

The invention is concerned with novel ingestible cross-linked homopolymers having functional groups consisting of linear or branched amines, of the formula: P-NR(CH2)n mN(R)2 or , (Ia) (Ib), and their pharmaceutically acceptable salts of the formulae: P-N+(R)2(CH)nMN+(R)3(m+l)X- (Ic), and, (Id) wherein P represents a hydrophobic, cross-linked and nondigestible homopolymer backbone; R is a hydrogen atom or a lower alkyl radical; X- is a pharmaceutically acceptable anion; m is an integer varying from 1 to 6 inclusive; and n o and p are, independently, integers varying from 2 to 12 inclusive. The amine functionalized and cross-linked homopolymers of the invention are highly efficient …

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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 March 22, 1991 and granted June 18, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2011.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 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.
FiledMarch 22, 1991
GrantedJune 18, 1996
Term endedMarch 22, 2011
Patent numberCA 2038852 C
Classification (IPC)A61K31/78

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedMarch 22, 1991Patent grantedJune 18, 1996Term endedMarch 22, 2011

Sources & verification

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