Patents by Inventor Ravi Kumar Laxman

Ravi Kumar Laxman 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).

  • Patent number: 6963006
    Abstract: A process for synthesizing an aminosilane compound such as bis(tertiarybutylamino)silane is provided. In one aspect of the present invention, there is provided a process for making bis(tertiarybutylamino)silane comprising reacting a stoichiometric excess of tert-butylamine with dichlorosilane under anhydrous conditions sufficient such that a liquid comprising the bis(tertiarybutylamino)silane product is produced.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: November 8, 2005
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Yin Pang Tsui, Thomas Elwood Zellner, Rajiv K. Agarwal, Ravi Kumar Laxman
  • Publication number: 20040138491
    Abstract: A process for synthesizing an aminosilane compound such as bis(tertiarybutylamino)silane is provided. In one aspect of the present invention, there is provided a process for making bis(tertiarybutylamino)silane comprising reacting a stoichiometric excess of tert-butylamine with dichlorosilane under anhydrous conditions sufficient such that a liquid comprising the bis(tertiarybutylamino)silane product is produced.
    Type: Application
    Filed: January 15, 2003
    Publication date: July 15, 2004
    Inventors: Yin Pang Tsui, Thomas Elwood Zellner, Rajiv K. Agarwal, Ravi Kumar Laxman
  • Patent number: 6576345
    Abstract: Thin films possessing low dielectric constants (e.g., dielectric constants below 3.0) are formed on integrated circuits or other substrates. Caged-siloxane precursors are linked in such a way as to form dielectric layers, which exhibit low dielectric constants by virtue of their silicon dioxide-like molecular structure and porous nature. Supercritical fluids may be used as the reaction medium and developer both to the dissolve and deliver the caged-siloxane precursors and to remove reagents and byproducts from the reaction chamber and resultant porous film created.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: June 10, 2003
    Inventors: Patrick A. Van Cleemput, Ravi Kumar Laxman, Jen Shu, Michelle T. Schulberg, Bunsen Nie
  • Patent number: 6340628
    Abstract: A chemical vapor deposition (CVD) process uses a precursor gas, such as with a siloxane or alkylsilane, and a carbon-dioxide-containing gas, such as CO2 with O2 or CO2 with CxH(2x+1)OH where 1≦x≦5, to deposit a dielectric layer with no photoresist “footing”, a low dielectric constant, and high degrees of adhesion and hardness. Because nitrogen is not used in the deposition process (the carbon-dioxide-containing gas replaces nitrogen-containing gases in conventional processes), amines do not build into the deposited layer, thereby preventing photoresist “footing”.
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: January 22, 2002
    Assignee: Novellus Systems, Inc.
    Inventors: Patrick A. Van Cleemput, Ravi Kumar Laxman, Jen Shu, Michelle T. Schulberg, Bunsen Nie
  • Patent number: 5976991
    Abstract: A process for the chemical vapor deposition of silicon dioxide and silicon oxynitride from reactant gases O.sub.2, O.sub.3, N.sub.2 O, NO, NO.sub.2, NH.sub.3 and a silane of the formula: (t-C.sub.4 H.sub.9 NH).sub.2 SiH.sub.2. A process whereby a stack of silicon containing dielectrics ranging from silicon nitride to silicon oxide may be deposited successively (at the same pressure and temperature) by changing the reactants O.sub.2, O.sub.3, N.sub.2 O, NO, NO.sub.2, NH.sub.3 while maintaing a constant flow of (t-C.sub.4 H.sub.9 NH).sub.2 SiH.sub.2. The films are suitable for use in the semiconductor and related industries.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: November 2, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ravi Kumar Laxman, David Allen Roberts, Arthur Kenneth Hochberg
  • Patent number: 5902893
    Abstract: A process for removal of Group 13 and/or 15 elements from an organosilane containing Group 13 and/or 15 elements as contaminants comprising contacting the organosilane with a reagent substantially soluble in the organosilane and capable of forming a complex with the Group 13 and/or Group 15 element which is less volatile than the organosilane, wherein the reagent is selected from the group consisting of thiols, alcohols, carboxylic acids, amines or mixtures thereof and separating the organosilane from the complex by distillation.
    Type: Grant
    Filed: May 20, 1997
    Date of Patent: May 11, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Ravi Kumar Laxman
  • Patent number: 5874368
    Abstract: A process for the low pressure chemical vapor deposition of silicon nitride from ammonia and a silane of the formula: (t-C.sub.4 H.sub.9 NH).sub.2 SiH.sub.2 provides improved properties of the resulting film for use in the semiconductor industry.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: February 23, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ravi Kumar Laxman, David Allen Roberts, Arthur Kenneth Hochberg, Herman Gene Hockenhull, Felicia Diane Kaminsky
  • Patent number: 5744196
    Abstract: The present invention is a process for very low temperature chemical vapor deposition of silicon dioxide, comprising the steps ofa) heating a substrate upon which silicon dioxide is to be deposited to a temperature in the range of approximately 150 to 500.degree. C. in a vacuum maintained at a pressure in the range of approximately 50 to 750 mTorr;b) introducing into said vacuum an organosilane containing feed and an oxygen containing feed, said organosilane containing feed consisting essentially of one or more compounds having the general formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently alkyl, alkenyl, alkynyl, or aryl, having C.sub.1 to C.sub.6, or R.sup.1 and R.sup.2 are combined to form an alkyl chain C.sub.x (R.sup.3).sub.2, where R.sup.3 is independently H, C.sub.x H.sub.2x+1, and x=1-6, and R.sup.4 is independently H, C.sub.y H.sub.2y+1 where y=1-6; andc) maintaining said temperature and vacuum thereby causing a thin film of silicon dioxide to deposit on the substrate.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: April 28, 1998
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ravi Kumar Laxman, Arthur Kenneth Hochberg