Patents by Inventor Edward Charles Dart

Edward Charles Dart 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: 4089763
    Abstract: A method of repairing teeth which comprises applying to the teeth a composition comprising (a) an inert, translucent, inorganic particulate filler (b) a polymerizable material comprising a polymerizable prepolymer containing at least two polymerizable ethylenically unsaturated groups and being the reaction product of a urethane prepolymer and a polymerizable ethylenically unsaturated monomer reactive with the urethane prepolymer; the urethane prepolymer being the reaction product of a diisocyanate and a diol; up to 100% by weight of the polymerizable prepolymer of a liquid ethylenically unsaturated monomer which is copolymerizable with the polymerizable prepolymer; and from 0.01 to 10% by weight of the polymerizable material of a photosensitive catalyst capable of curing the composition on exposure to visible light and comprising a photosensitizer selected from fluorenone and an .alpha.-diketone of the formula A.CO.CO.
    Type: Grant
    Filed: March 17, 1976
    Date of Patent: May 16, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: Edward Charles Dart, John Burnett Cantwell, James Rodney Traynor, Joseph Franciszek Jaworzyn, Jozef Nemeck
  • Patent number: 4071424
    Abstract: A photopolymerizable composition comprising at least one polymerizable ethylenically unsaturated material, for example, an ethylenically unsaturated monomer, and a photosensitive catalyst comprisingA. at least one photosensitizer having the structure ##STR1## where X is >C=O, >CR.sub.1 R.sub.2 or >CR.sub.3 OR.sub.4, especially >C=O, R.sub.1 to R.sub.4 and hydrogen or hydrocarbyl groups, n is 0 or 1, and the groups A are hydrocarbyl or substituted hydrocarbyl groups, the groups A being aromatic or substituted aromatic when n is 1 and X is >CR.sub.1 R.sub.2 and when n is 0, andB. at least one reducing agent, for example, an amine or a phosphine, capable of reducing the photosensitizer when the photosensitizer is in an excited state.
    Type: Grant
    Filed: February 11, 1975
    Date of Patent: January 31, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: Edward Charles Dart, Josef Nemcek