Hydroxynaphthoic acids and derivatives
CA 2288199 A1 · Owner: Royer, Robert E. · Inventors: Royer, Robert E.; Deck, Lorraine M.; Vander Jagt, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In one embodiment, the present invention provides a compound comprising formula (I), wherein A = H or OH, X = OH a halogen, OR, NHR, NR', R'' where , R R', and R'' = H, C1-8alkyl, C2-8alkenyl or C2-8alkynyl, cycloalkyl, cycloalkenyl aryl, aralkyl or heterocyclic, substituted or unsubstituted; and R1,R2,R3,R4,R5 = H, C1-8alkyl, C2-8alkenyl or C2-8alkynyl, cycloalkyl, cycloalkenyl aryl or heterocyclic, substituted or unsubstituted wherein R1 , includes at least one methylene spacer through which R1 is attached to said compound. The present invention also provides methods for making hydroxynaphthoic acids.
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 April 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2020.
- 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.