Patents by Inventor Ajay K. Dhaul

Ajay K. Dhaul 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).

  • Hydrolyzed chlorosilicon by-product addition to cement
    Patent number: 5374310
    Abstract: The present invention is an improved process for preparing a portland cement composition where the process comprises heat calcining a mixture comprising a source of calcium and a source of silicon to form clinker. The improvement comprises providing to the process a silicon containing product resulting from the hydrolysis of chlorosilicon by-product as at least a portion of the source of silicon.
    Type: Grant
    Filed: September 29, 1992
    Date of Patent: December 20, 1994
    Assignee: Dow Corning Corporation
    Inventors: Timothy R. Bunce, Ajay K. Dhaul, Roland L. Halm, Richard G. Johnson, Ronald E. Lund
  • Conversion of direct process high-boiling component to silane monomers in the presence of hydrogen gas
    Patent number: 5326896
    Abstract: The present invention is a process for converting a high-boiling component resulting from the reaction of an organochloride with silicon into commercially more desirable monosilanes. The process comprises contacting the high-boiling component with hydrogen gas at a temperature within a range having a lower limit greater than 250.degree. C. and an upper limit of 1000.degree. C. Yield of the present process may be improved by use of a catalyst selected from a group consisting of activated carbon, platinum metal, platinum supported on alumina, palladium supported on carbon, SbCl.sub.5, H.sub.2 PtCl.sub.6, BCl.sub.3, AlCl.sub.3, and AlCl.sub.3 supported on a support material selected from a group consisting of carbon, alumina, and silica. In a preferred embodiment of the present process the process is run at a pressure within a range of about 250-1000 psig. The present process is preferential for the production of diorganodichlorosilane in relation to organotrichlorosilane in the monosilane product.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: July 5, 1994
    Assignee: Dow Corning Corporation
    Inventors: Kirk M. Chadwick, Ajay K. Dhaul, Roland L. Halm, Richard G. Johnson
  • Conversion of direct process high-boiling component to chlorosilane monomers in the presence of chlorine
    Patent number: 5321147
    Abstract: The present invention is a process for converting a high-boiling component resulting from the reaction of an organochloride with silicon into commercially more desirable monosilanes. The process comprises contacting the high-boiling component with chlorine at a temperature within a range of about 250.degree. C. to 1000.degree. C. Improved yield of monosilanes can be obtained in the process by the use of a catalyst selected from a group consisting of alumina, silica. activated carbon, AlCl.sub.3, and AlCl.sub.3 supported on a support selected from a group consisting of alumina, silica, and carbon.
    Type: Grant
    Filed: July 16, 1993
    Date of Patent: June 14, 1994
    Assignee: Dow Corning Corporation
    Inventors: Kirk M. Chadwick, Ajay K. Dhaul, Roland L. Halm, Richard G. Johnson, Robert D. Steinmeyer
  • Catalytic conversion of direct process high-boiling component to chlorosilane monomers in the presence of hydrogen chloride
    Patent number: 5292912
    Abstract: The present invention is a process for converting a high-boiling component resulting from the reaction of an organochloride with silicon into commercially more desirable monosilanes. The process comprises contacting the high-boiling component with hydrogen chloride at a temperature within a range of about 250.degree. C. to 1000.degree. C. in the presence of a catalyst selected from a group consisting of activated carbon, platinum supported on alumina, zeolite, AlCl.sub.3, and AlCl.sub.3 supported on a support selected from a group consisting of carbon, alumina, and silica.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: March 8, 1994
    Assignee: Dow Corning Corporation
    Inventors: Kirk M. Chadwick, Ajay K. Dhaul, Roland L. Halm, Richard G. Johnson
  • Catalytic conversion of direct process high-boiling component to chlorosilane monomers in the presence of hydrogen chloride and hydrogen
    Patent number: 5292909
    Abstract: The present invention is a process for converting a high-boiling component resulting from the reaction of an organochloride with silicon into commercially more desirable monosilanes. The process comprises contacting the high-boiling component with hydrogen chloride and hydrogen gas at a temperature within a range of about 250.degree. C. to 1000.degree. C. in the presence of a catalyst selected from a group consisting of activated carbon, alumina, silica, zeolite, AlCl.sub.3, AlCl.sub.3 supported on a support selected from a group consisting of carbon, silica, and alumina; platinum supported on a support selected from a group consisting of carbon, silica, and alumina; and palladium supported on a support selected from a group consisting of carbon, silica, and alumina.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: March 8, 1994
    Assignee: Dow Corning Corporation
    Inventors: Kirk M. Chadwick, Ajay K. Dhaul, Roland L. Halm, Richard G. Johnson