Phosphoric diesters
CA 1269669 C · Owner: Yamamoto, Itaru · Inventors: Yamamoto, Itaru; Ogata, Kazumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a novel phosphoric diesters of general formula:, wherein R1 and R2 are the same or different and each means a methyl group or a hydrogen atom provided that, at least one of R1 and R2 is a hydrogen atom or a salt, thereof which can be produced by reacting .beta. .gamma. or .delta.tocopherol with a halophosphorylating agent such as phosphorus oxychloride, reacting the resultant product with ascorbic acid whereof hydroxyl groups at 5- and 6-positions are protected, and then removing protected groups from the hydroxyl groups. The phosphoric diester has antiinflammatory activity.
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
- Granted May 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 2007.
- 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.