Patents by Inventor Jayant S. Lodaya

Jayant S. Lodaya 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).

  • Manufacture of zinc hexasulfide amine complexes
    Patent number: 6420581
    Abstract: A process for the manufacture of zinc hexasulfide amine complexes comprising reacting zinc, sulfur and a molar excess of amine at an elevated temperature to obtain a reaction mixture comprising zinc hexasulfide amine complexes and excess amine. A first solvent in which the zinc hexasulfide amine complexes are largely not soluble is added to obtain a slurry of the reaction mixture. The zinc hexasulfide amine complexes may be recovered in a subsequent separation process.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: July 16, 2002
    Assignee: Flexsys America L.P.
    Inventors: Jayant S. Lodaya, Otto W. Maender, Paul M. Mitchem
  • Process for the manufacture of a sulfenimide
    Patent number: 6184385
    Abstract: A process for the manufacture of a sulfenimide by reacting sulfenamide in slurry with a water immiscible organic solvent with an acid to yield a solvent slurry comprising sulfenimide product. The product is recovered from the solvent slurry by a method comprising the addition of water to the solvent slurry and the isolating of the product by a single filtration step. While water is added to the solvent slurry an azeotrope of solvent and water may be distilled under vacuum until substantially all solvent is separated from product and product becomes part of an aqueous slurry. Alternatively, water may be added to the solvent slurry while the resulting mixture is being agitated, followed by filtering the mixture in the single filtration step for recovery of product from the mixture.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: February 6, 2001
    Assignee: Flexsys America L.P.
    Inventors: Jayant S. Lodaya, Donald L. Fields, Jr., Raymond T. Parker, Phillip B. Balderson
  • Preparation of quinoneimines from hydroxyphenylamines using a hypochlorite as an oxidation agent
    Patent number: 6072061
    Abstract: A hydroxyphenylamine compound can be converted, with high yield and high selectivity, into its corresponding quinoneimine by reacting the hydroxyphenylamine with a hypochlorite oxidation reactant.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: June 6, 2000
    Assignee: Flexsys America L.P.
    Inventors: Donald L. Fields, Jr., Jayant S. Lodaya
  • Preparation of quinoneimines from hydroxyphenylamines using hydrogen peroxide and a catalyst
    Patent number: 6043384
    Abstract: A hydroxyphenylamine compound can be converted, with high selectivity, into its corresponding quinoneimine by reacting the hydroxyphenylamine with hydrogen peroxide in the presence of a catalyst.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: March 28, 2000
    Assignee: Flexsys America L.P.
    Inventors: Donald L. Fields, Jr., Raymond Lohr, Jr., Jayant S. Lodaya
  • Preparation of quinonediimines from phenylenediamines using oxygen and a metal or metal salt catalyst
    Patent number: 6025508
    Abstract: A phenylenediamine compound can be converted, with high selectivity, into its corresponding quinonediimine by reacting the phenylenediamine with oxygen and a metal catalyst or a salt thereof.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: February 15, 2000
    Assignee: Flexsys America L.P.
    Inventors: Jayant S. Lodaya, Raymond A. Lohr, Jr., Donald L. Fields, Jr.