Water insoluble cross-linked polycarbonic acid compositions
CA 2185331 A1 · Owner: Ligochem, Inc. · Inventors: Krupey, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided water insoluble cross-linked polyhydroxy polycarboxylic acid having at least two strands each having a strand skeleton of forumula (III) wherein one carbonyl group of at least one maleoyl moiety thereof in each strand is covalently linked to a -HN.(H)p(CH)z.(OH)m.NH- moiety to provide the presence therein of at least one cross linking moiety of formula (V) wherein R is hydrogen or lower alkylene or lower alkoxy of 1-4 carbon atoms or phenyl, z is an integer of 1 - 4, p is 0 or an integer up to z - 1 m is 1 , or an integer up to z, wherein the ratio of cross-links to poly (alkylene carbonic acid) strands is between about 1 and about 200 to 2. There is disclosed a …
Read the whole patent
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 14, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.