Shape-memory laminated polybutylene terephthalate film, production process and use thereof, and process for production of polybutylene terephthalate film
CA 2499491 A1 · Owner: Kagawa, Seiji · Inventors: Kagawa, Seiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laminated polybutylene terephthalate film having an excellent shape memory and high dimensional stability under heat which is obtained by (1) bonding a , polybutylene terephthalate film to another film or a laminated film and forming the obtained laminate at a temperature (T1) not higher than the glass transition temperature of the polybutylene terephthalate while keeping it in the first shape, (2) forming the obtained shaped laminate into the second shape at a temperature (T2) exceeding the above glass transition temperature and (3) cooling the obtained shaped laminate to a temperature (T3) not higher than the above glass transition temperature.
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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 September 22, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2025.
- 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.