Processes for preparing 2-substituted hydroxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetic acid or its salts
CA 2021447 A1 · Owner: Sakane, Kazuo · Inventors: Terasawa, Takeshi; Sakane, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds represented by the general formula(II):, (II), in which R1 represents an organic group and, R? represents a lower alkanoylamino group. Salts of these compounds are also disclosed. These compounds are useful for the preparation of compounds of the general formula(I), (I), where R? represents an amino or a protected amino group and R1 is the same as above, which have an excellent antimicrobial activity. Compounds I can be prepared by hydrolyzing a compound of formula II. Compound II may be prepared by introducing an amino protecting group in position 5 of the compound of general formula(III), (III)
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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
- Filed July 18, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 2012.
- 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.