Sustained release compositions
CA 1263597 C · Owner: Zweigle, Maurice Laverne · Inventors: Zweigle, Maurice Laverne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compositions capable of the sustained release of active organic agents comprising an aqueous dispersion of a water-insoluble cellulose ether which cellulose ether particles have reversibly diffused therein the active agent. The dispersions may be used as dispersions, dewatered to form a powder or coalesced, to form films or other articles all of which are capable of sustained release of the active agent.
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
- Granted December 5, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 5, 2006.
- 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.