Patents by Inventor S. Subramaniam

S. Subramaniam 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).

  • Synthesis of silyl cyanohydrins
    Patent number: 5594156
    Abstract: A process for preparing silyl cyanohydrins that comprises reacting an aldehyde or ketone with a hydrogen cyanide, a trisubstituted halosilane and a correspondingly substituted disilazane or silyl amine.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: January 14, 1997
    Assignee: Huls America Inc.
    Inventors: Chitoor S. Subramaniam, Gerald L. Larson
  • Method of preparing 1.1-dialkoxycycloalkanes
    Patent number: 5550299
    Abstract: Ortho esters of the structure ##STR1## wherein R.sub.1 and R.sub.2 are different or the same alkyl moieties and can be a saturated, unsaturated, branched, unbranched or cyclic alkyl moiety of 1-3 carbon atoms, are prepared by first anhydrously reacting hydrogen cyanide or a hydrogen cyanide derivative with a secondary alkanol and hydrogen chloride in the presence of an inert organic solvent. Upon the formation of the resulting imino ether hydrochloride, more secondary alkanol is added to form the ortho esters (I). 1,1-Dialkoxycycloalkanes of the structure ##STR2## wherein R.sub.1 and R.sub.2 correspond to R.sub.1 and R.sub.2 of structure (I), and n is an integer from 4 to 9, are prepared by reacting with the imino ether hydrochloride more secondary alkanol and a cycloalkanone having 5 to 10 carbon atoms.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: August 27, 1996
    Assignee: Huls America Inc.
    Inventors: Chitoor S. Subramaniam, Thomas V. John, David Colvin, George W. Bitler
  • Method of preparing ortho esters and 1.1-dialkoxycycloalkanes
    Patent number: 5401885
    Abstract: Ortho esters of the structure ##STR1## wherein R.sub.1 and R.sub.2 are different or the same alkyl moieties and can be a saturated, unsaturated, branched, unbranched or cyclic alkyl moiety of 1-3 carbon atoms, are prepared by first anhydrously reacting hydrogen cyanide or a hydrogen cyanide derivative with a secondary alkanol and hydrogen chloride in the presence of an inert organic solvent. Upon the formation of the resulting imino ether hydrochloride, more secondary alkanol is added to form the ortho esters (I). 1,1-Dialkoxycycloalkanes of the structure ##STR2## wherein R.sub.1 and R.sub.2 correspond to R.sub.1 and R.sub.2 of structure (I), and n is an integer from 4 to 9, are prepared by reacting with the imino ether hydrochloride more secondary alkanol and a cycloalkanone having 5 to 10 carbon atoms.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: March 28, 1995
    Assignee: Huls America, Inc.
    Inventors: Chitoor S. Subramaniam, Thomas V. John, David Colvin, George W. Bitler
  • 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