2,2-difluoropropionic acid derivatives
CA 1318327 C · Owner: Tohzuka, Takashi · Inventors: Ohsaka, Yohnosuke; Kohno, Satoru; Negishi, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, The invention relates to 2,2-difluoropropionic acid derivatives of the following formula, XCH2CF2COY (I) wherein X is chlorine, bromine, iodine a group of the, formula:, R1O- (II), or R2COO- (III) wherein R1 and R2 are each an aliphatic or halogenated aliphatic hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 8 carbon atoms optionally bearing at least one substituent or a group of the, formula:, X'CH2CF2CF2O- (IV) wherein X' is fluorine, chlorine, bromine iodine, or the, group of the formula: R1O- or R2COO- as defined above; and Y is fluorine, a group of the formula:, -OR3 (V) wherein R3 is an aliphatic or halogenated aliphatic hydrocarbon …
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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 May 25, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 25, 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.