Polyester film and photosensitive material
CA 2058244 A1 · Owner: Suzuki, Masaru · Inventors: Tsunashima, Kenji; Mimura, Takashi; Kurome, Hirokazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyester film comprising a polyester whose dicarboxylic acid copolymerized component contains (i) an aromatic dicarboxylic acid having a metal sulfonate and/or a derivative thereof and (ii) a polyetherdicarboxylic acid represented by the following chemical formula (a) and having a mean molecular weight in the range of 600 to 20000 and/or a derivative thereof. R1OOCCH2-(O-R2)n -OCH2COOR3 (a) Where, "R1" and "R3" are H or alkyl groups each having a carbon number of 1 to 8, "R2" is alkylene group having a carbon number of 2 to 8 and "n" is a positive integer. The polyester film has excellent transparency, mechanical properties and dimensional stability such as those of a PET film and an …
Read the whole patent
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 December 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 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.