Patents by Inventor Tirthankar Ghosh

Tirthankar Ghosh 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: 7390774
    Abstract: Antimicrobial compositions and methods of making and using the same are disclosed. The disclosed antimicrobial compositions provide persistent, broad spectrum, antimicrobial activity. The antimicrobial compositions may be used in the preparation of antimicrobial articles. The antimicrobial compositions may also be used to inhibit the growth of microorganisms by introducing those compositions onto or into an environment subject to microbial attack.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: June 24, 2008
    Assignee: Rohm and Haas Company
    Inventors: Tirthankar Ghosh, Barry Weinstein
  • Publication number: 20080115291
    Abstract: A composition useful for treating fabrics. The composition contains a silver-containing copolymer having polymerized units of a monomer X and a monomer Y; wherein monomer X is an ethylenically unsaturated compound having a substituent group selected from an unsaturated or aromatic heterocyclic group having at least one hetero atom selected from N, O and S; wherein monomer Y is selected from carboxylic acids, carboxylic acid salts, carboxylic acid esters, organosulfuric acids, organosulfuric acid salts, sulfonic acids, sulfonic acid salts, phosphonic acids, phosphonic acid salts, vinyl esters, (meth)acrylamides, C8-C20 aromatic monomers containing at least one exocyclic ethylenic unsaturation and combinations thereof.
    Type: Application
    Filed: October 29, 2007
    Publication date: May 22, 2008
    Inventors: Stephanie Nussbaum Cottrell, Tirthankar Ghosh
  • Publication number: 20080072791
    Abstract: A method for treating wood to inhibit leaching of copper compounds into the environment. The method comprises treating the wood with a copper-containing wood preservative and a latex copolymer.
    Type: Application
    Filed: August 23, 2007
    Publication date: March 27, 2008
    Inventors: John William Ashmore, David Michael Laganella, Tirthankar Ghosh, Nilesh Shah
  • Patent number: 7335613
    Abstract: Treated fiber substrates and methods of making and using the same are disclosed. The disclosed treated fiber substrates provide persistent, durable, broad spectrum, antimicrobial activity. The treated fiber substrates may be used in a variety of materials to impart antimicrobial activity thereto.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: February 26, 2008
    Assignee: Rohm and Haas Company
    Inventors: Stephanie Nussbaum Cottrell, Tirthankar Ghosh, Barry Weinstein
  • Publication number: 20070282063
    Abstract: A latex copolymer composition comprising >5 wt % of polymerized units derived from a monomer X containing an unsaturated heterocycle, wherein the latex copolymer composition comprises ?1,000 ppm of residual monomer X is disclosed. Also disclosed are methods of making and using the latex copolymer compositions.
    Type: Application
    Filed: May 15, 2007
    Publication date: December 6, 2007
    Inventors: Tirthankar Ghosh, Morris C. Wills
  • Patent number: 7300874
    Abstract: A method for chemical mechanical polishing of semiconductor substrates containing a metal layer requiring removal and metal interconnects utilizing a composition containing engineered copolymer molecules comprising hydrophilic functional groups and relatively less hydrophilic functional groups; the engineered copolymer molecules enabling contact-mediated reactions between the polishing pad surface and the substrate surface during CMP resulting in minimal dishing of the metal interconnects in the substrate.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: November 27, 2007
    Assignee: Rohm and Haas Electronic Materials CMP Holdings, Inc.
    Inventors: Barry Weinstein, Tirthankar Ghosh
  • Publication number: 20070082935
    Abstract: A method for disinfecting or sanitizing a surface by applying an antimicrobial composition comprising a metal-polymer complex.
    Type: Application
    Filed: September 28, 2006
    Publication date: April 12, 2007
    Inventors: Li-Liang Chia, Tirthankar Ghosh, Barry Weinstein, Terry Williams
  • Publication number: 20070006391
    Abstract: Fibers that durably contain antimicrobial materials such that the antimicrobial materials are resistant to being abraided away or washed off during use. The antimicrobial materials contained in the fibers are not prone to the development of resistant strains of bacteria. Also disclosed are methods of making and using the fibers.
    Type: Application
    Filed: July 6, 2006
    Publication date: January 11, 2007
    Inventors: Tirthankar Ghosh, Barry Weinstein
  • Publication number: 20060240263
    Abstract: A method for preserving wood by contacting wood with a composition comprising an aqueous polymer dispersion, at least one surfactant, and a wood preservative.
    Type: Application
    Filed: April 21, 2006
    Publication date: October 26, 2006
    Inventors: John Ashmore, Tirthankar Ghosh, Jose Lalas
  • Publication number: 20060110924
    Abstract: An aqueous abrasive-free composition is useful for chemical mechanical polishing of a patterned semiconductor wafer containing a nonferrous metal. The composition comprises an oxidizer, an inhibitor for the nonferrous metal, 0 to 15 weight percent water soluble modified cellulose, 0 to 15 weight percent phosphorus compound, 0.005 to 5 weight percent of an amphiphilic polymer, the amphiphilic polymer having an ionic hydrophilic portion with a carbon number of 2 to 250 and water.
    Type: Application
    Filed: November 24, 2004
    Publication date: May 25, 2006
    Inventors: Tirthankar Ghosh, Robert Solomon, Hongyu Wang
  • Publication number: 20050226914
    Abstract: Treated fiber substrates and methods of making and using the same are disclosed. The disclosed treated fiber substrates provide persistent, durable, broad spectrum, antimicrobial activity. The treated fiber substrates may be used in a variety of materials to impart antimicrobial activity thereto.
    Type: Application
    Filed: March 17, 2005
    Publication date: October 13, 2005
    Inventors: Stephanie Cottrell, Tirthankar Ghosh, Barry Weinstein
  • Publication number: 20050227895
    Abstract: Antimicrobial compositions and methods of making and using the same are disclosed. The disclosed antimicrobial compositions provide persistent, broad spectrum, antimicrobial activity. The antimicrobial compositions may be used in the preparation of antimicrobial articles. The antimicrobial compositions may also be used to inhibit the growth of microorganisms by introducing those compositions onto or into an environment subject to microbial attack.
    Type: Application
    Filed: March 3, 2005
    Publication date: October 13, 2005
    Inventors: Tirthankar Ghosh, Barry Weinstein
  • Patent number: 6936541
    Abstract: A method for planarizing metal interconnects of a semiconductor wafer includes the steps of polishing the semiconductor wafer with a polishing solution and a polishing pad to planarize the metal interconnects. The polishing solution has by weight percent, 0.15 to 5 benzotriazole, 0 to 1 abrasive, 0 to 10 polymeric particles, 0 to 5 polymer-coated particles and balance water at a pH of less than 5 and a removal rate-pressure sensitivity (dr/dp) of at least 750 (?/min/psi). The polishing simultaneously accelerates removal of projecting metal from the metal interconnects with the polishing pad providing a first pressure that increases removal rate of the projecting metal; and it inhibits removal of recessed metal from the metal interconnects with the polishing pad providing a second pressure that decreases removal of the recessed metal.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: August 30, 2005
    Assignee: Rohn and Haas Electronic Materials CMP Holdings, Inc.
    Inventors: Jinru Bian, Tirthankar Ghosh, Terence M. Thomas
  • Publication number: 20050159003
    Abstract: A method for chemical mechanical polishing of semiconductor substrates containing a metal layer requiring removal and metal interconnects utilizing a composition containing engineered copolymer molecules comprising hydrophilic functional groups and relatively less hydrophilic functional groups; the engineered copolymer molecules enabling contact-mediated reactions between the polishing pad surface and the substrate surface during CMP resulting in minimal dishing of the metal interconnects in the substrate.
    Type: Application
    Filed: March 10, 2005
    Publication date: July 21, 2005
    Inventors: Barry Weinstein, Tirthankar Ghosh
  • Patent number: 6902590
    Abstract: A method for chemical mechanical polishing of semiconductor substrates containing a metal layer requiring removal and metal interconnects utilizing a composition containing engineered copolymer molecules comprising hydrophilic functional groups and relatively less hydrophilic functional groups; the engineered copolymer molecules enabling contact-mediated reactions between the polishing pad surface and the substrate surface during CMP resulting in minimal dishing of the metal interconnects in the substrate.
    Type: Grant
    Filed: September 17, 2003
    Date of Patent: June 7, 2005
    Assignee: Rohm and Haas Electronic Materials CMP Holdings, Inc
    Inventors: Barry Weinstein, Tirthankar Ghosh
  • Patent number: 6753016
    Abstract: A method for the protection of wood and other wood materials without affecting dimensional stability or surface integrity of the treated material is described. The method involves treating wood material with an iron salt and selected oxidants where the iron salt is preferably complexed with organic chelating ligands. Preferably, a microbicidal agent is also incorporated into the method to provide treated wood products that demonstrate excellent surface integrity, dimensional stability and retention of the infused microbicidal agents for extended periods of time without incurring the detrimental environmental effects of conventional chromium or copper-based inorganic salt preservation methods.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: June 22, 2004
    Assignee: Rohm and Haas Company
    Inventor: Tirthankar Ghosh
  • Publication number: 20040065020
    Abstract: A method for chemical mechanical polishing of semiconductor substrates containing a metal layer requiring removal and metal interconnects utilizing a composition containing engineered copolymer molecules comprising hydrophilic functional groups and relatively less hydrophilic functional groups; the engineered copolymer molecules enabling contact-mediated reactions between the polishing pad surface and the substrate surface during CMP resulting in minimal dishing of the metal interconnects in the substrate.
    Type: Application
    Filed: September 17, 2003
    Publication date: April 8, 2004
    Inventors: Barry Weinstein, Tirthankar Ghosh
  • Publication number: 20040023492
    Abstract: A method for planarizing metal interconnects of a semiconductor wafer includes the steps of polishing the semiconductor wafer with a polishing solution and a polishing pad to planarize the metal interconnects. The polishing solution has by weight percent, 0.15 to 5 benzotriazole, 0 to 1 abrasive, 0 to 10 polymeric particles, 0 to 5 polymer-coated particles and balance water at a pH of less than 5 and a removal rate-pressure sensitivity (dr/dp) of at least 750 (Å/min/psi). The polishing simultaneously accelerates removal of projecting metal from the metal interconnects with the polishing pad providing a first pressure that increases removal rate of the projecting metal; and it inhibits removal of recessed metal from the metal interconnects with the polishing pad providing a second pressure that decreases removal of the recessed metal.
    Type: Application
    Filed: March 28, 2003
    Publication date: February 5, 2004
    Inventors: Jinru Bian, Tirthankar Ghosh, Terence M. Thomas
  • Patent number: 6679928
    Abstract: A polishing composition for polishing a semiconductor substrate has a pH of under 5.0 and comprises (a) a carboxylic acid polymer comprising polymerized unsaturated carboxylic acid monomers having a number average molecular weight of about 20,000 to 1,500,000 or blends of high and low number average molecular weight polymers of polymerized unsaturated carboxylic acid monomers, (b) 1 to 15% by weight of an oxidizing agent, (c) up to 3.0% by weight of abrasive particles, (d) 50-5,000 ppm (parts per million) of an inhibitor, (e) up to 3.0% by weight of a complexing agent, such as, malic acid, and (f) 0.1 to 5.0% by weight of a surfactant.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: January 20, 2004
    Assignee: Rodel Holdings, Inc.
    Inventors: Wesley D. Costas, Tirthankar Ghosh, Jinru Bian, Karel-Anne Valentine
  • Publication number: 20030232906
    Abstract: High pH aqueous coating compositions containing 3-isothiazolone microbicide that have been stabilized against the degradation of the 3-isothiazolone by the addition of low levels of copper ion are disclosed. In particular, aqueous paint compositions containing pH-adjusting amine compounds, where the pH is above 9.5, are effectively stabilized when 1 to 200 ppm of copper ion is added to the paint composition before the 3-isothiazolone is combined with other paint components or if copper ion is added together with the 3-isothiazolone to the remaining paint components or if the 3-isothiazolone is added no more than 1 hour before copper ion is added to the composition.
    Type: Application
    Filed: June 4, 2003
    Publication date: December 18, 2003
    Inventor: Tirthankar Ghosh