Process for producing 1-acyl-2-pyrazoline derivative
CA 1319366 C · Owner: Mitsui Chemicals, Incorporated · Inventors: Okumura, Kunio; Iizuka, Hajime; Ohto, Norio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1-Acyl-2-pyrazoline derivatives represented by the formula, where R1 denotes a hydrogen atom pyridyl group, pyrazinyl, group, alkyl group aryl group, or alkoxy group; and R2, R3 and R4 independently denote a hydrogen atom furyl, group, pyridyl group, alkyl group or aryl group, are, produced by cyclizing by heating an acylhydrazone derivative represented by the formula, where R1 R2, R3, and R4 are defined as above, to produce compounds having useful anti-cerebral edema activity.
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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 June 22, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 22, 2010.
- 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.