Patents by Inventor Peter W. Stanier

Peter W. Stanier 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: 7662363
    Abstract: An amorphous silica suitable for use in a dental composition has a weight mean particle size in the range 3 to 15 ?m with at least 90 per cent by weight of particles having a size below 20 ?m, a Radioactive Dentine Abrasion (RDA) determined on an aqueous slurry of the silica powder of 100 to 220, a Pellicle Cleaning Ratio (PCR), when incorporated in a dental composition at 10 per cent by weight, greater than 85, the ratio of PCR to RDA being in the range 0.4:1 to less than 1:1 and having a Plastics Abrasion Value (PAV) in the range 11 to 19. A silica having the above properties is prepared by a precipitation route. The silica made available by the invention is also useful as an anti-blocking agent in plastics.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: February 16, 2010
    Assignee: PQ Silicas UK Limited
    Inventors: Peter W. Stanier, Simon R. Stebbing
  • Publication number: 20030044442
    Abstract: A granular composition for use in a personal care product comprises at least one water-insoluble inorganic material having a particle size of no more than 50 &mgr;m and up to 10 percent by weight based on weight of water-insoluble inorganic material of a non-binding swelling agent, the granules having a particle size greater than about 50 &mgr;m and up to about 1000 &mgr;m, as measured by sieve analysis, a dry strength such that from about 20 to about 70 percent by weight pass through a 212 &mgr;m sieve when subjected to the attrition test defined herein and a wet strength such that less than 12 percent by weight residue remains on a 45 &mgr;m sieve after ultrasonification in water for 1 minute with 48 &mgr;m amplitude of vibration, and wherein said granules possess sufficient strength so as not to substantially break down when present in said personal care product.
    Type: Application
    Filed: August 29, 2002
    Publication date: March 6, 2003
    Inventors: Peter W Stanier, Pamela E Baines
  • Patent number: 6479036
    Abstract: Silica particles for incorporation into a dentifrice composition, preferably as a thickening agent, have a polyether glycol such as polyethylene glycol applied thereto in order to enhance dentifrice cohesion
    Type: Grant
    Filed: December 5, 2000
    Date of Patent: November 12, 2002
    Assignee: Crosfield Limited
    Inventors: Peter W Stanier, Charlotte R Evans
  • Patent number: 6399111
    Abstract: An amorphous silica having an RDA value of between 40 and 70, an oil absorption capacity of between 90 and 145 cc/100 g and a moisture loss of less than 7% w/w, can be incorporated at a 10% to 25% loading into a transparent toothpaste having a refractive index of below 1.445, this toothpaste having an RDA value of less than 60.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: June 4, 2002
    Assignee: Crosfield Limited
    Inventor: Peter W. Stanier
  • Patent number: 5855898
    Abstract: A thickening system containing an amorphous silica and xanthan gum in a silica/xanthan gum weight ratio from 160:1 to 2:1, preferably 100:1 to 5:1, most preferably 30:1 to 6.5:1 can be used to stabilise and thicken cosmetic compositions containing alpha-hydroxy carboxylic acids.
    Type: Grant
    Filed: December 2, 1996
    Date of Patent: January 5, 1999
    Assignee: Crosfield Limited
    Inventors: Pamela E. Baines, Peter W. Stanier
  • Patent number: 5637636
    Abstract: An amorphous silica has a pore size distribution wherein 90% of the pores have a diameter above 15 nanometers, and less than 20% of the pore volume is in pores having a pore diameter between 10 and 20 nanometers, the amorphous silica having a CTAB surface area of less than 100 m.sup.2 /g, the amorphous silica having a matting efficiency of below 20 gloss units at an incidence angle of 60.degree. and a loading of 5% by weight. It can be prepared by a precipitation route. It is used in thixotropic paints and lacquers.
    Type: Grant
    Filed: June 15, 1995
    Date of Patent: June 10, 1997
    Assignee: Crosfield Limited
    Inventors: Simon Cartwright, Ian P. McKeown, Peter W. Stanier
  • 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
  • Patent number: 5512271
    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 100 to 450 m.sup.2 /g, a weight mean particle size of 5 to 15 microns, a plastics abrasion value of 16 to 26, a mean pore diameter from 2 to 12 nm, a transmission of at least 70% in the refractive index range from 1.430 to 1.443 and an oil absorption in the range from about 70 to about 130 cm.sup.3 /g.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: April 30, 1996
    Assignee: Unilever Patent Holdings BV
    Inventors: Ian P. McKeown, Peter W. Stanier
  • 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
  • Patent number: 5098695
    Abstract: A precipitated silica, suitable for use in toothpastes, has a high absorbency, i.e. 110 to 180 cm.sup.3 100 g, and good abrasivity with a plastics abrasion value of 12 to 20. The silica provides abrasion even at a relatively low particle size.
    Type: Grant
    Filed: January 24, 1991
    Date of Patent: March 24, 1992
    Assignee: Unilever Patent Holdings, B.V.
    Inventors: John R. Newton, James P. Quinn, Peter W. Stanier
  • 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
  • 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
  • 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