Patents by Inventor David Howard Birtwistle

David Howard Birtwistle 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).

  • Hair treatment compositions
    Patent number: 6696051
    Abstract: This invention relates to an aqueous conditioner composition comprising (i) a cationic surfactant, (ii) a fatty alcohol material, and (iii) from 0.01 to 10 wt % coated particles comprising (a) a solid core having a D3,2 average particle size in the range from 10 to 700 nm, and (b) a coating of silicone polymer covalently bonded to the solid core. Use of the coated particles in a conditioner composition to impart body to the hair is also disclosed.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: February 24, 2004
    Assignee: Unilever Home & Personal Care USA, division of Conopco, Inc.
    Inventors: Elena Maria Gabriella Barbuzzi, Wolfgang Robert Bergmann, David Howard Birtwistle, Cheryl Anne Taylor, Stephen Lee Wire
  • Hair treatment compositions
    Publication number: 20030095943
    Abstract: This invention relates to an aqueous conditioner composition comprising (i) a cationic surfactant, (ii) a fatty alcohol material, and (iii) from 0.01 to 10 wt % coated particles comprising (a) a solid core having a D3,2 average particle size in the range from 10 to 700 nm, and (b) a coating of silicone polymer covalently bonded to the solid core. Use of the coated particles in a conditioner composition to impart body to the hair is also disclosed.
    Type: Application
    Filed: April 30, 2002
    Publication date: May 22, 2003
    Applicant: Unilever Home & Personal Care USA, Division of Conopco, Inc.
    Inventors: Elena Maria, Gabriella Barbuzzi, Wolfgang Robert Bergmann, David Howard Birtwistle, Cheryl Anne Taylor, Stephen Lee Wire
  • Hair treatment compositions
    Patent number: 6524563
    Abstract: A hair treatment composition which comprises 0.01-5.0 wt % of a particulate substance which is substantially unagglomerated or unaggregated prior to incorporation in the composition, which particulate substance has a modal primary particle size of 7-40 nm, and a Youngs modulus of at least 4 Gpa, preferably at least 6 GPa.
    Type: Grant
    Filed: October 25, 2000
    Date of Patent: February 25, 2003
    Assignee: Unilever Home & Personal Care, USA, division of Conopco, Inc.
    Inventors: Stephen Lee Wire, Keith Leslie Rutherford, Robert George Riley, David Howard Birtwistle
  • Shampoo compositions and method
    Patent number: 6355234
    Abstract: An aqueous conditioning shampoo composition comprising, in addition to water: i) at least one surfactant chosen from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof: ii) emulsified particles of an insoluble, nonvolatile silicone; iii) a soluble cationic hair conditioning polymer having a cationic charge density of about +3.0 meq/gram or less, in which the emulsified particles of insoluble, nonvolatile silicone are incorporated into the shampoo composition as a preformed aqueous emulsion having an average silicone particle size in the emulsion and in the shampoo composition of from 2 to 30 microns.
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: March 12, 2002
    Assignee: Helene Curtis, Inc.
    Inventors: David Howard Birtwistle, Siripom Dechsinga, Andrew Malcolm Murray
  • Shampoo compositions and method
    Patent number: 5977038
    Abstract: An aqueous conditioning shampoo composition comprising, in addition to water:i) at least one surfactant chosen from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof:ii) emulsified particles of an insoluble, nonvolatile silicone;iii) a soluble cationic hair conditioning polymer having a cationic charge density of about +3.0 meq/gram or less,in which the emulsified particles of insoluble, nonvolatile silicone are incorporated into the shampoo composition as a preformed aqueous emulsion having an average silicone particle size in the emulsion and in the shampoo composition of from 2 to 30 microns.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: November 2, 1999
    Assignee: Helene Curtis, Inc.
    Inventors: David Howard Birtwistle, Siriporn Dechsinga, Andrew Malcolm Murray
  • Hair treatment compositions
    Patent number: 5776444
    Abstract: Hair treatment compositions which can generate style benefits while giving good conditioning comprise a non-rigid, emulsion polymerised cross-linked silicone conditioning polymer having from about 0.05% to about 10% branched monomer units.
    Type: Grant
    Filed: April 5, 1996
    Date of Patent: July 7, 1998
    Assignee: Chesebrough-Pond's USA Co., Division of Conopco, Inc.
    Inventors: David Howard Birtwistle, Andrew Malcolm Murray