Phenol terminated diester composition and curable compositions containing same
CA 2089173 C · Owner: Yezrielev, Albert I. · Inventors: Wellman, William E.; Yezrielev, Albert I.; Kowalik, Ralph M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed towards: non-liquid crystalline phenol-terminated diester compositions which may be liquids or solids and crosslinkable formulations containing a mixture of the phenol terminated diesters and an amino crosslinking agent. These diesters are characterized by the structure of formula (1). Also within the scope of the present invention are crosslinkable formulations comprising a mixture of amino crosslinking agent and phenol terminated diesters based on polyester diols containing carbonate and groups of aliphatic and aliphatic/aromatic polycarbonates containing carbonate and groups characterized by structure (2). The invention is also directed to a single stage …
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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 August 16, 1991 and granted February 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 2013.
- 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.