Polyester resin exhibiting optical anisotropy in molten states and resin composition
CA 2000451 A1 · Owner: Hijikata, Kenji · Inventors: Kageyama, Yukihiko; Hayashi, Noriyuki; Hijikata, Kenji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyester resin exhibiting optical anisotropy in a molten state comprises constituent units represented by the following formulas (I) to (III) as essential components wherein the contents of the units (I), (II) and (III) are less than 30 mole % 30 to 45 mole % and 30 to 45 mole %, respectively based on the total amount of the constituent units: (I) , (II) , (III)
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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 October 11, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2011.
- 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.