Substituted tetracyanoquinodimethanes, processes for their preparation and their use
CA 2094458 A1 · Owner: Ciba-Geigy Ag · Inventors: Zambounis, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substituted tetracyanoquinodimethanes processes for their preparation and their use Abstract, Compounds of the formula I, in which Rl and R2 independently of one another are C1-C6alkyl C3-C8cycloalkyl which is, unsubstituted or substituted by C1-C4alkyl or phenyl or benzyl which is unsubstituted or substituted by F, Cl, Br, C1-C6alkyl, C1-C6alkoxy or di(C1-C6alkyl)amino. The compounds are suitable as .pi.-acceptors and electrical semiconductors and they can be, used for antistatic finishing of objects.
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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 April 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2015.
- 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.