Microdispersions of hydroxamated polymers
CA 2069169 C · Owner: American Cyanamid Company · Inventors: Ryles, Roderick G.; Heitner, Howard I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Stable, water-in-oil microdispersions comprising a continuous phase of an oil and an emulsifier and a discontinuous phase of an aquaeous solution of a hydroxamated polymer are disclosed. Also disclosed is a method for the production of the above-described microdispersions wherein neutralized hydroxylamine and excess base are reacted with a microdispersion of the polymer.
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 May 21, 1992 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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
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.