Patents by Inventor Andrew C. Barclay

Andrew C. Barclay 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: 4484949
    Abstract: A water hardenable cement composition comprising a fluorine-free calcium alumino silicate glass in particulate form in which the individual particulates have a particle size of less than 100 microns consisting essentially of 25-35% silica, 27-35% calcium oxide, 25-40% alumina, up to 4% of an alkali metal oxide, up to 5% of titania, the total amount of alkali metal oxide and titania being 0.5-9%, wherein the ratio of calcium oxide to silica is 0.7:1 to 1:0-7, together with a polycarboxylic acid.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: November 27, 1984
    Assignee: Smith & Nephew Research Limited
    Inventors: William D. Potter, Andrew C. Barclay, Reginald Dunning, Richard J. Parry
  • Patent number: 4438212
    Abstract: The invention relates to calciumaluminosilicate glasses. The glasses contain, in weight percent, 25 to 35% silica, 27 to 35% calcium oxide, 25 to 40% alumina, 0 to 4% of alkali metal oxide selected from lithium oxide, sodium oxide and potassium oxide, and 0 to 5% of titanium oxide and a total content of lithium, sodium, potassium and titanium oxides of 0.5 to 9%. The glasses, in finely divided form, react with aqueous polycarboxylic acids and set to a solid mass; cements made from the glass and polycarboxylic acids are useful in splinting compositions.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: March 20, 1984
    Assignee: Pilkington Brothers P.L.C.
    Inventors: William D. Potter, Andrew C. Barclay, Reginald Dunning, Richard J. Parry
  • Patent number: 4137086
    Abstract: A novel calcium fluoroaluminosilicate glass consisting essentially of from 25 to 35% by weight of silicon calculated as silica, from 30 to 40% by weight of aluminum calculated as alumina, from 20 to 35% by weight calcium, calculated as calcium oxide, and up to 9% by weight fluorine (preferably 4-7%) can be associated with a poly(carboxylic acid e.g. as an intimate mixture of glass and acid to constitute a composition curable on contact with water and useful, for example, as a loading on a splinting bandage. Such a bandage preferably has a ratio of set time to gel time from 4:1 to 8:1 with a minimum gel time.
    Type: Grant
    Filed: November 17, 1977
    Date of Patent: January 30, 1979
    Assignee: Pilkington Brothers Limited
    Inventors: William D. Potter, Andrew C. Barclay, Reginald Dunning, Richard J. Parry
  • Patent number: 4123416
    Abstract: A novel calcium fluoroaluminosilicate glass consisting essentially of from 25 to 35% by weight of silicon calculated as silica, from 30 to 40% by weight of aluminum calculated as alumina, from 20 to 35% by weight calcium, calculated as calcium oxide, and up to 9% by weight fluorine (preferably 4-7%) can be associated with a poly(carboxylic acid) e.g. as an intimate mixture of glass and acid to constitute a composition curable on contact with water and useful, for example, as a loading on a splinting bandage. Such a bandage preferably has a ratio of set time to gel time from 4:1 to 8:1 with a minimum gel time of 60 seconds.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: October 31, 1978
    Assignee: Smith & Nephew Research Limited
    Inventors: William D. Potter, Andrew C. Barclay, Reginald Dunning, Richard J. Parry