Degradable cellulose polymers
CA 2109618 A1 · Owner: Battelle Memorial Institute, Pacific Northwest Division · Inventors: Sinclair, Richard G.; Lipinsky, Edward S.
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 to a thermoplastic cellulose ester polymer composition having improved degradation properties upon exposure to moisture. The composition includes a cellulose ester and a degradation promoter. The degradation promoter after, formation of the polymer composition into an end-product and in the presence of moisture, is water soluble and leachable from the polymer end-product or in the presence of moisture hydrolyzes to, form water soluble by-products which are leachable from the polymer end-product. The degradation promoter also acts as a catalyst to enhance the hydrolysis of the cellulose acetate resulting in a, mixture of cellulose and acetic acid. The …
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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 May 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 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.