Process for producing dioxoquinazolines
CA 2196510 C · Owner: Sumitomo Chemical Company, Limited · Inventors: Komatsu, Masashi; Ueda, Hiroshi; Nishii, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing an dioxoquinazoline of following formula (II):, (see fig. II), wherein R1 and R2; independently represent a hydrogen atom a halogen, atom, a nitro group, a lower alkyl group an aralkyl group, an alkoxy, group, an alkoxylcarbonyl group or a group represented by YNR3R4 wherein Y represents a direct bond, a lower alkylene group or a carbonyl group, and R3 and R4 independently represent a lower alkyl group or N, R3 and R4 may bond together to form a five- or sixmember heterocycle, which comprises reacting an anthranylamide of formula (I): (see fig. I), (I), wherein R1 and R2 are as defined above and X represents a hydrogen, atom, a lower alkyl group an aralkyl group or a …
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 January 31, 1997 and granted August 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2019.
- 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.