Bis(indolyl) ethylenes: process for their preparation and record systems utilizing such compounds
CA 1338715 C · Owner: Mathiaparanam, Ponnampalam · Inventors: Mathiaparanam, Ponnampalam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Novel bis-(indolyl)ethylenes, process for their production and record systems utilizing such bis-(indolyl ethylene chromogens are described. Bis-(indolyl)ethylenes of the following general formula are prepared:, (I), wherein each L1 and L2 is the same or different and is each independently selected from indole moieties (J1) through (J4) (L1 need not be the same as L2) , (J1) (J2), , (J3) (J4), wherein in (J1) through (J4) above each of R5, R6, R13, R14, R21, R22, R29 and R30 need not be the same and is each independently selected from hydrogen alkyl (C1-C8), cycloalkyl, alkylaroxy, alkylalkoxy and substituted or, unsubstituted aryl such as phenyl, naphthyl, or heterocyclyl. Each of R1 R2, …
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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 November 12, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2013.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.