Patents by Inventor Ram R. Chawla

Ram R. Chawla 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).

  • Preparation of alkyl(amino)dialkoxysilanes
    Patent number: 6114558
    Abstract: Alkyl(amino)dialkoxysilanes are prepared by anhydrously reacting stoichiometric amounts of an alkoxysilane and an alkylaminomagnesium chloride in a reverse addition process. The alkylamino magnesium chloride is preferably prepared in situ by the reaction of a Grignard reagent (RMX) and an alkylamine in a suitable aprotic solvent, such as tetrahydrofuran. The "alkyl" substituent can be alkyl, arylalkyl or aryl. The reaction can be conducted in the temperature range of from 25.degree. C. to 75 .degree. C., without a catalyst, and the aprotic solvent is recovered for re-use in the process.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: September 5, 2000
    Assignee: Sivento Inc.
    Inventors: Gerald L. Larson, Ram R. Chawla
  • Preparation of trialkylsilyl nitrile
    Patent number: 5258534
    Abstract: Trialkylsilyl nitrile is prepared by anhydrously reacting stoichiometric amounts of trialkylsilyl halide, hexaalkyldisilazane or trialkylsilyl amine, and hydrogen cyanide, in the absence or presence of a solvent or inert gas atmosphere. No catalyst is necessary, and the reaction preferably is performed at a temperature of from 5.degree. C. to 25.degree. C.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: November 2, 1993
    Assignee: Huls America, Inc.
    Inventors: Gerald L. Larson, Thomas V. John, Ram R. Chawla, Chitoor S. Subramaniam