Malonic acid derivatives
CA 1308718 C · Owner: Uchida, Matazaemon · Inventors: Nakayama, Keisuke; Taninaka, Kuniaki; Kubota, Shuhei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a malonic acid derivative represented by the general formula (I) (I), wherein R1 and R2, which may be the same or different represents hydrogen atom; C1-C12 alkyl group; C1-C9 alkyl group substituted with C1-C5 alkoxy group a tetrahydro-, furyl group, a phenyl group or a phenyl group substituted with 1 to 3 groups selected from the group consisting of halogen atoms, C1-C5 alkyl groups and C1-C5 alkoxy groups; or C2-C6 alkenyl group; R3 and R4 which may be, the same or different, represent hydrogen atom C1-C6, alkyl group, C2-C6 alkenyl group C2-C8 alkoxyalkyl, group, benzoyl group C2-C8 alkylcarbonyl group, C2-C8, alkoxycarbonyl group C1-C4 alkylsulfonyl group or, …
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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 October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 2009.
- 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.