Dye-containing light-polarizing film
CA 1317077 C · Owner: Nishii, Yutaka · Inventors: Kawasaki, Sinjiro; Nishii, Yutaka; Okada, Toyokazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a dyecontaining light-polarizing film wherein a disazo dye represented by the formula (I) is used: (I), wherein Me represents a transition metal being copper, nickel, zinc or iron, R represents a 1-naphthol or 2naphthol residue which is bonded to azo group at the position adjacent to its hydroxyl group forming a complex bond together with the transition metal and which may have a substituent such as a sulfonic acid sulfonamide, amino, acylamino or arylamino group or a hydroxyl group not adjacent to the azo group X and Y, represent a hydrogen atom, a C1-C4 alkyl lower alkoxy, carboxylic acid, sulfonic acid sulfonamide, sulfon-, alkylamide, amino acrylamino or …
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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
- Granted May 4, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 4, 2010.
- 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.