8-hydroxy-2h-dibenzb,fazepin-2-one dyes
CA 2081867 A1 · Owner: Corey, Paul F. · Inventors: Corey, Paul F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are 8-hydroxy-2H-dibenzb,fazepin-2one dyes of the formula, wherein X is CH2CH2 or CH=CH and Y is H or an enzyme cleavable group, chromogenic enzyme substrates made from them, methods for preparing the same an analy-, tical testing device using same and a method for the detection of an enzyme in solution by way of a detectable response in a substrate.
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 October 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2014.
- 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.