Patents by Inventor Francesco Parravicini

Francesco Parravicini has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pyridazine derivatives
    Patent number: 5082939
    Abstract: A novel process for preparing alkoxyalkylidenehydrazinopyridazine derivatives which comprises reducing a novel alkoxytriphenylmethylazopyridazine derivative, removing the triphenylmethyl group and reacting with an aldehyde or ketone derivative.A specific compound produced by this process is 3-[3-[[2-(3,4-dimethoxyphenyl)ethyl]amino]-2-hydroxypropoxy]-6-isopropylid enehydrazinopyridazine.
    Type: Grant
    Filed: July 25, 1989
    Date of Patent: January 21, 1992
    Assignee: I.S.F. Societa per Azioni
    Inventors: Carlo Farina, Mario Pinza, Alberto Cerri, Francesco Parravicini
  • Process for preparing alkoxyalkylidenehydrazinopyridazine derivatives
    Patent number: 4873328
    Abstract: A novel process for preparing alkoxyalkylidenehydrazinopyridazine derivatives which comprises reducing a novel alkoxytriphenylmethylazopyridazine derivative, removing the triphenylmethyl group and reacting with an aldehyde or ketone derivative.A specific compound produced by this process is 3-[3-[[2-(3,4-dimethoxyphenyl)ethyl]amino]-2-hydroxypropoxy]-6-isopropylid enehydrazinopyridazine.
    Type: Grant
    Filed: January 5, 1988
    Date of Patent: October 10, 1989
    Assignee: I.S.F. Societa Per Azioni
    Inventors: Carlo Farina, Mario Pinza, Alberto Cerri, Francesco Parravicini
  • Process of making ethyl{6-[ethyl-(2-hydroxypropyl)amino]-3-pyridazinyl}hydrazinecarboxylat e
    Patent number: 4581449
    Abstract: A novel method of preparing ethyl{6-[ethyl-(2-hydroxypropyl)amino]-3-pyridazinyl}hydrazinecarboxylate is disclosed, wherein 7-chloro-3-methyl-4-oxo-4H-pyridazino[6,1-c][1,2,4]triazine is treated with ethyl-(2-hydroxypropyl)amine. The corresponding amino derivative is hydrolized in mild conditions and the hydrazino compound thus obtained is suitably acylated.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: April 8, 1986
    Assignee: I.S.F. S.p.A.
    Inventors: Francesco Parravicini, Mario Pinza
  • Acylated hydrazinopyridazine antihypertensives
    Patent number: 4086343
    Abstract: Antihypertensive compounds comprising hydrazinopyridazine derivatives of the formula: ##STR1## wherein R is an alkyl radical containing from 1 to 4 carbon atoms or an alkyl radical having from 1 to 4 carbon atoms substituted with a hydroxy group and R.sub.1 is a hydrogen atom, an alkyl radical containing from 1 to 4 carbon atoms, a phenyl or 3-pyridyl group and their non-toxic pharmaceutically acceptable salts with inorganic or organic acids. Also pharmaceutical compositions containing the same.
    Type: Grant
    Filed: June 7, 1977
    Date of Patent: April 25, 1978
    Assignee: I.S.F. SpA
    Inventors: Luciano Dorigotti, Francesco Parravicini