Therapeutic rings
CA 1298688 C · Owner: Dow Corning France S.A. · Inventors: Pocknell, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification describes and claims a method of making therapeutic rings from a curable silicone rubber based composition. The rings are capable of controlled release of the therapeutic agent in the human or animal body. The method comprises the steps of:, (i) extruding a first composition comprising a therapeutic agent and a first elastomer-forming silicone composition to provide a core; (ii) extruding a second composition comprising a second elastomer-forming silicone composition to provide a sheath enclosing the core;, (iii) bringing together end portions of a piece of extruded core and sheath to form a ring (iv) effecting crosslinking of the extruded core and, (v) effecting …
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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 April 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 14, 2009.
- 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.