Aromatic derivative and preparation method thereof
CA 1285573 C · Owner: Hazato, Atsuo · Inventors: Hazato, Atsuo; Kurozumi, Seizi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aromatic derivative having the formula (I) or the salt thereof:, (I), wherein R1 and R2 independently represent a hydrogen atom, hydroxyl, a halogen atom, or OR3 wherein R3 is C1-C10 alkyl; A-B represents a hydrocarbon moiety having 1 to 10 carbon atoms and containing at least one double bond or a sulfur- or oxygen-containing hydrocarbon moiety having 1 to 10 carbon atoms; n is an integer of 2 to 4; X represents a group, -?-O, -O-, -O-?or -?-NH- and Y represents a hydrogen, atom; alkyl having 1 to 5 carbon atoms which may be substituted with aryl; alkenyl having 2 to 5 carbon atoms which may be substituted with aryl or aryl suhstituted with at least one C1-C5 alkoxy; aryl which may be …
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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
- Granted July 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 2, 2008.
- 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.