Polyamic acid structures, and methods of fabrication thereof
CA 2044573 A1 · Owner: Goldblatt, Ronald D. · Inventors: Davis, Charles R.; Goldblatt, Ronald D.; Park, Jae M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A structure comprising a free-standing polyamic acid film substantially free of phthalic acids. A method of fabricating such a structure which comprises applying a polyamic acid solution to a substrate, partially or substantially completely removing the solvent from the polyamic acid solution by heating the same removing the, free-standing polyamic acid film which is free from phthalic acids, laminating the film to a substrate at elevated temperature and pressure and thermally curing the laminated, free-standing polyamic acid film to the corresponding polyimide. A structure comprising one or a plurality of such free-standing polyamic acid films with electrically conducting layers …
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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 June 13, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 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.