Optical recording medium and recording method
CA 2044969 C · Owner: Mitsui Chemicals, Incorporated · Inventors: Ueno, Keiji; Murakami, Shinichi; Koike, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical recording medium capable of pit length recording comprising a transparent injection moled resin plate, a recording layer containing a phthalocyanine dye of the formula (1) and a covering layer laminated subsequently:, ( 1 ), where Z1 - Z16 are selected from hydrogen hologen, R1, OR2, SR3, COOR4, COONR5R6 SiR7R8R9 and NR10R11 and M, is a divalent metal.
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 June 19, 1991 and granted May 13, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 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.