1-oxadethiacepham compounds
CA 1099715 A · Owner: Shionogi & Co. Ltd. · Inventors: Kikkawa, Ikuo; Yoshioka, Mitsuru; Hamashima, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1-Oxadethiacepham Compounds, ABSTRACT, Intermediates for preparing an antibacterial 1-dethia-1-oxacephalosporins which are represented by the following formula: (wherein R is a monovalent group deducted the carbonyl from an acyl derived from a carboxylic or carbonic acid; Y1 is a divalent group of the following formula: , , , or , (in which COB is carboxy or protected carboxy; X is hydrogen or a nucleophilic group; and Z is a leaving group), are prepared from a compound of the following formula: (wherein R and Y1 are as defined above) by the action of an acid. The new compounds of this invention shown by the following formula:, (wherein A is amino or substituted amino; E is hydrogen 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 April 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 21, 1998.
- 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
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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.