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L-alpha-hydrazino-alpha-substituted-beta-(3,4-dihydroxyphenyl)propionic acid substantially free of the d isomer,the lower alkyl esters thereof,and the pharmaceutically acceptable salts thereof,wherein the substituent is lower alkyl

US 3,830,827 A · Inventors: PINES S et al.

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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  • Granted August 20, 1974. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by August 20, 1991.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledSeptember 7, 1972
GrantedAugust 20, 1974
Term endedAugust 20, 1991
Application number—
Classification (CPC)C07C243/00
Length4 pages

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1973197519771979198119831985198719891991Application filedSep 7, 1972Patent grantedAug 20, 1974Term endedAug 20, 1991

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Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

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