Compound, preparation and use
CA 2052075 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Tyreman, Neville; Austin, Peter William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula, in which R1 and R2 taken together and R3 and R4 taken together, independently represent a polymethylene chain having 3 or 4 carbon atoms, or a polymethylene chain having 3 or 4 carbon atoms substituted by at least one lower alkyl radical having from 1 to 4 carbon atoms, and R5 to R8 are independently hydrogen hydrocarbyl or, substituted hydrocarbyl. Typically R1 and R2 and also R3 and R4 complete a trimethylene ring, R5 and R7 are each hydrogen and R6 and R8 are alkyl such as methyl. The compounds have microbiological activity.
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 September 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 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.