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Expired Canadian patentCanada

Sugar-containing water-absorbing composition which facilitates fiber formation

CA 1331691 C · Owner: Camelot Superabsorbents Limited · Inventors: Le-Khac, Bi

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

A copolymer of recurring units of at least one .alpha..beta.-unsaturated monomer and recurring units of at least one copolymerizable comonomer comprising in its, preferred embodiment from about 20 to about 80 percent pendant carboxylic acid units and from about 80 to about 20 percent pendant carboxylate salt units is blended with, at least one disaccharide or oligosaccharide to produce a water-absorbing composition upon curing. The composition is particularly suitable for fiber formation.

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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 August 30, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 30, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 14, 1987
GrantedAugust 30, 1994
Term endedAugust 30, 2011
Patent numberCA 1331691 C
Classification (IPC)C08L35/00 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedDec 14, 1987Patent grantedAug 30, 1994Term endedAug 30, 2011

Sources & verification

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