Patents by Inventor Flaviano Rigamonti

Flaviano Rigamonti 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).

  • Process for producing .alpha.-chloroacetoacetic acid monomethylamide
    Patent number: 4992585
    Abstract: In the production of .alpha.-chloroacetoacetic acid monomethylamide by reaction of chlorine with acetoacetic acid monomethylamide in an aqueous medium at temperature of -20 to +10.degree. C. in the presence of urea and alkali metal salts, neutralization of the reaction mixture, separation of solid .alpha.-chloroacetoacetic acid monomethylamide and feeding back of the mother liquor into the next batch, yield and purity of the product are improved by extracting the mother liquor obtained each time after the separation of .alpha.-chloroacetoacetic acid monomethylamide, before the mother liquor is fed back into the next batch, with an inert solvent immiscible with water.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: February 12, 1991
    Assignee: Ciba-Geigy Corporation
    Inventors: Flaviano Rigamonti, Pullissery Raghunandan