Patents by Inventor Havard J. Prosser

Havard J. Prosser 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).

  • Sustained release composition
    Patent number: 4880628
    Abstract: A sustained release device which comprises a source of at least one trace chemical element incorporated in a cement and releasable therefrom on contact with an aqueous medium.The trace chemical element is exemplified by selenium, cobalt and iodine and the cement is exemplified by a phosphate cement.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: November 14, 1989
    Assignee: National Research Development Corporation
    Inventors: William M. Allen, Bernard F. Sansom, Alan D. Wilson, Havard J. Prosser, David M. Groffman
  • Coated substrates
    Patent number: 4836768
    Abstract: A body having a substrate surface which comprises corrodible material and on which substrate surface is present a coherent protective layer of an anti-corrosion composition which comprises a solid matrix of electrical conductivity .gtoreq.10.sup.-6 mho cm.sup.-1 and formed by reaction between at least water-soluble Bronsted acid and at least one Lewis base in which matrix is incorporated an elemental metal, or an alloy thereof, the matrix and metal being effective in service as electrolyte and sacrificial anode, respectively.
    Type: Grant
    Filed: April 15, 1987
    Date of Patent: June 6, 1989
    Assignee: National Research Development Corporation
    Inventors: Alan D. Wilson, Havard J. Prosser, Anthony J. Dunsdon, John C. Skinner, Pauline J. Brookman
  • Cement-forming compositions
    Patent number: 4758612
    Abstract: A hardenable composition which comprises (i) a poly(carboxylic acid) or precursor thereof (as herein defined); (ii) a particulate ion-leachable silicate, aluminosilicate or metal oxide reactable with (i) in the presence of water to set to a hardened composition; and (iii) a compound comprising at least one phosphorus-carbon or phosphorus-boron covalent bond, in an amount effective in service to extend the working time of the composition.
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: July 19, 1988
    Assignee: National Research Development Corporation
    Inventors: Alan D. Wilson, Havard J. Prosser, David M. Groffman, Gary S. Sayers
  • Sustained release composition
    Patent number: 4661339
    Abstract: A sustained release device which comprises a source of at least one trace chemical element incorporated in a cement and releasable therefrom on contact with an aqueous medium. A preferred cement is copper phosphate cement.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: April 28, 1987
    Assignee: National Research Development Corp.
    Inventors: William M. Allen, Bernard F. Sansom, Alan D. Wilson, Havard J. Prosser, David M. Groffman