Substituted naphthalocyanines and their use
CA 2030392 A1 · Owner: Baumann, Marcus · Inventors: Mizuguchi, Jin; Baumann, Marcus; Stricker, Hanspeter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
6-17839/-, Substituted naphthalocyanines and their use Abstract, Compounds of the formula I, (I) in which R is the group , and M is two H or is Cu or Ni R1 is -OH, -Cl, -Br, C1-C30alkoxy or -OC(O)R2 m is an integer from 2 to 6 and n is a number from 1 to 20, and R2 is C1-C20alkyl, C2-C20alkenyl cyclopentyl, cyclohexyl or C6-C10aryl or C6-C10arylmethyl which is unsubstituted or substituted by Cl-C18alkyl. The compounds are dyes and IR absorbers and can be used for optical information storage systems employing diode lasers.
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 November 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2012.
- 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.