Patents by Inventor Derek Aldcroft

Derek Aldcroft 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).

  • Particulate carrier for biocide formulations
    Patent number: 6905698
    Abstract: A particulate carrier material is impregnated with a biocidal formulation and serves as a vehicle for introduction of the biocide into a liquid-based media, such as a surface coating or surface cleaning compositions, in order to allow controlled release of the biocide to combat bacterial, fungal, algal or like growth for an extend period of time.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: June 14, 2005
    Assignee: Ineos Silicas Limited
    Inventors: Derek Aldcroft, Helen Jones, Dafydd Turner, Michel Edge, Julie Robinson, Kenneth Seal
  • Granular compositions
    Patent number: 6670311
    Abstract: A granular composition, especially for incorporation in washing powder formulations, comprises at least 40% by weight of an amorphous silica and typically at least 30% by weight of a functional ingredient such as a perfume, the amorphous silica having a surface area of at least 550 m2/g, a pore volume from about 1.0 to about 2.5 ml/g and a particle size of no more than 50 microns, the granules of said composition having a particle size from about 200 to about 2000 microns.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: December 30, 2003
    Assignee: Quest International BV
    Inventors: Derek Aldcroft, Stephen Moreton, Mike Halliday, Joseph Brain, Richard A Birch
  • Silica products and UV curable systems
    Patent number: 6039798
    Abstract: Wax coated silica matting agent wherein the silica is an amorphous silica having a pore volume of at least 1.5 cm.sup.3 /g, preferably at least 1.8 cm.sup.3 /g. The wax coating is present in the range from 6% to 15% by weight of the matting agent and comprises a synthetic polyethylene wax.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: March 21, 2000
    Assignee: Crosfield Limited
    Inventors: Derek Aldcroft, Sharron Bates, Graham James Earl
  • Amorphous silicas
    Patent number: 5643624
    Abstract: An amorphous silica has a pore volume in the range of from about 1.6 to about 2.5 cc g.sup.-1, a mean pore diameter in the range of from about 8.0 to about 20 nm, a surface area in the range from about 450 to about 1100 m.sup.2 g.sup.-1 and an oil absorption in the range of from about 250 to about 350 cc/100g.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: July 1, 1997
    Assignee: Unilever Patent Holdings BV
    Inventors: Derek Aldcroft, John Robert Newton, Peter William Stanier
  • Silicas
    Patent number: 5624652
    Abstract: Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 10 to 90 M.sup.2 /g, a weight mean particle size of 5 to 15 micron, and a plastics abrasion value of 16 to 20, a transmission of at least 70% in the RI range from 1,430 to 1,443 and an oil absorbtion in the range from about 70 to about 150 cm.sup.3 /100 g.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: April 29, 1997
    Assignee: Crosfield Limited
    Inventors: Derek Aldcroft, Peter W. Stanier
  • Amorphous silica
    Patent number: 5447704
    Abstract: An amorphous silica, especially precipitated silica, suitable for use in toothpastes, has a high abrasivity represented by a perspex abrasion value in the range from about 23 to about 35.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: September 5, 1995
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Derek Aldcroft, John R. Newton, James P. Quinn, Peter W. Stainier
  • Silica products
    Patent number: 5326395
    Abstract: A silica matting agent has a wax coating comprising a mixture of three waxes, i.e. hard microcrystalline, plasticising monocrystalline and synthetic polyethylene. The use of this ternary mixture gives the matting agent improved interaction with lacquers and improved sedimentation.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: July 5, 1994
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Derek Aldcroft, Ian P. McKeown, Bryan Rogers, Peter W. Stanier
  • Process for refining glyceride oil using precipitated silica
    Patent number: 5264597
    Abstract: The invention relates to a process for refining glyceride oil comprising the steps of contacting the oil with amorphous silica, wherein said silica is selected from the group of precipitated amorphous silicas having a surface area of at least 400 m.sup.2 /g in pores with a diameter from at least 2 nm. Preferably said precipitated amorphous silicas have a pore volume in the range of about 1.3 to 2.5 ml/g, in pores having a pore diameter in the range of 3.6 to 1000 nm.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: November 23, 1993
    Assignee: Van den Bergh Foods, Co., Division of Conopco, Inc.
    Inventors: Josef P. Van Dalen, Jannes G. Lammers, Derek Aldcroft
  • Method for stabilizing alcoholic beverages using an aqueous suspension containing amorphous silica
    Patent number: 5232724
    Abstract: Amorphous silica can be prepared in a stable and pumpable suspension, suitable for use in alcoholic beverage stabilisation, by adding a polysaccharide or inorganic gelling agent. Examples of polysaccharides are carboxy methyl celluloses, guar gum and Xanthan gum. Preferably the suspension contains sorbic acid, benzoic acid or a benzoate to give synergistic action with the polysaccharide.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: August 3, 1993
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Derek Aldcroft, John R. Newton
  • Stable suspensions for filtering beer
    Patent number: 5102676
    Abstract: Amorphous silica can be prepared in a stable and pumpable suspension, suitable for use in alcoholic beverage stabilisation, by adding a polysaccharide or inorganic gelling agent. Examples of polysaccharides are carboxy methyl celluloses, guar gum and Xanthan gum. Preferably the suspension contains sorbic acid, benzoic acid or a benzoate to give synergistic action with the polysaccharide.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: April 7, 1992
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Derek Aldcroft, John R. Newton
  • Silicas
    Patent number: 5035879
    Abstract: Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 420 to 550 m.sup.2 /g, a weight mean particle size of 5 to 20 micron, a perspex abrasion value of 15 to 28, a mean pore diameter from 3 to 8 nm and a transmission of at least 70% in the R1 range from 1.444 to 1.460.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: July 30, 1991
    Assignee: Unilever Patent Holdings BV
    Inventors: Derek Aldcroft, John R. Newton, Peter W. Stanier
  • Silicas
    Patent number: 4992251
    Abstract: Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 420 to 550 m.sup.2 /g, a weight mean particle size of 5 to 20 micron, a perspex abrasion value of 15 to 28, a mean pore diameter from 3 to 8 nm and a transmission of at least 70% in the R1 range from 1.444 to 1.460.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: February 12, 1991
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Derek Aldcroft, John R. Newton, Peter W. Stanier
  • Silicas
    Patent number: 4956167
    Abstract: An amorphous silica, especially precipitated silica, suitable for use in toothpastes, has a high abrasivity represented by a perspex abrasion value in the range from about 23 to about 35.
    Type: Grant
    Filed: March 22, 1989
    Date of Patent: September 11, 1990
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Derek Aldcroft, John R. Newton, James P. Quinn, Peter W. Stanier
  • Process for the preparation of precipitated silicas having morphology similar to pyrogenic silicas
    Patent number: 4127641
    Abstract: A multistage precipitation and flocculation production process is disclosed in which primary silica particles are prepared and flocculated useing an alkali metal salt solution and further silica precipitated in the presence of the salt, the pH of the mixture reduced and the silica isolated, purified carefully dried and optionally milled.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: November 28, 1978
    Assignee: Joseph Crosfield and Sons Limited
    Inventors: Derek Aldcroft, Donald Barby, Anthony L. Lovell, James P. Quinn
  • Fine silicas
    Patent number: 3954944
    Abstract: This invention discloses a new form of wet precipitated silica which is characterised in terms of energy required to breakdown particles and a defined thickening effect. A multistage precipitation and flocculation production process is also disclosed in which primary silica particles are prepared and flocculated using an alkali metal salt solution and further silica precipitated in the presence of the salt, the pH of the mixture reduced and the silica isolated, purified carefully dried and optionally milled.
    Type: Grant
    Filed: March 8, 1973
    Date of Patent: May 4, 1976
    Assignee: Joseph Crosfield & Sons, Ltd.
    Inventors: Derek Aldcroft, Donald Barby, Anthony Leonard Lovell, James Philip Quinn