Internally charged hydrophobically modified copolymers
CA 2081632 A1 · Owner: Bristol-Myers Squibb Company · Inventors: Ramireddy, Chittamuru; Jachowicz, Janusz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymers of the structure (I), (W) (X) (Y) (Z), and, (II), (A) (B) wherein G is -OH and OR3SO3-M+;, Q is -OR3-; -NHR3 ; -OR3MHCONHR3and, -OR3NHCOOR3-;, R is H or methyl;, R1 is an alkyl of from 1 to 4 carbons especially, methyl;, R2 is an alkyl of from 10 to 24 carbons preferably, from 12 to 18 carbons, R3 is an alkylene radical of from 2 to 4 carbons especially ethyl;, J is an anion especially chloride bromide or iodide;, M is a cation, especially sodium or potassium; w, x, y, and z, a and b designate the number of moles of the monomeric units in accordance with the mole fraction and mole ratio constraints: w/x and w/y are about 0.4 or greater; w/z is from about 199:1 to about 0.67:1; w/(x …
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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 October 28, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2014.
- 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
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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.