Patents by Inventor Philip I. Mayo

Philip I. Mayo 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).

  • Magnetic recording medium having a binder system including a polyurethane polymer having both phosphonate and quaternary ammonium pendant groups
    Patent number: 6139982
    Abstract: A magnetic recording medium comprising a magnetic layer provided upon a major surface of a substrate, wherein the magnetic layer includes a magnetic pigment, and a polymeric binder system containing a polyurethane having (1) a plurality of pendant phosphonate ester groups effective for promoting wetting of the magnetic pigment by the polymeric binder system, and (2) at least one quaternary ammonium group effective for promoting wetting of the magnetic pigment by the polymeric binder system.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: October 31, 2000
    Assignee: Imation Corp.
    Inventors: William E. Bottomley, Philip I. Mayo, Ruth M. Erkkila
  • Surface modification of magnetic particle pigments
    Patent number: 6099895
    Abstract: The invention is a surface modifier for magnetic pigments having the formula:(Ar).sub.n --R--PO.sub.3 H.sub.2 (I)where Ar represents an aryl group, R represents an aliphatic group of 1-6 carbons and n is an integer of 1 or more. The invention also includes magnetic recording media made using such surface modifiers.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: August 8, 2000
    Assignee: Imation Corp.
    Inventors: Philip I. Mayo, Ian T. Morgan, Colin F. Norman, Robert J. D. Nairne
  • Formation and photographic use of solid particle dye dispersions
    Patent number: 6045986
    Abstract: The present invention provides a method of forming a dispersion of solid particles of a dye in a gelatin medium which includes the steps of milling the solid dye in the present of a glycerophospholipid dispersant in an aqueous medium and diluting the resulting dispersion with an aqueous solution containing a gelatin. In addition, a photographic element is provided comprising a support having coated thereon at least one silver halide emulsion layer and at least one additional gelatin layer that contains a dispersion of solid particles of a dye and a glycerophospholipid dispersant.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: April 4, 2000
    Assignee: Tulalip Consultoria Commerial Sociedade Unipessoal S.A.
    Inventors: Philip I. Mayo, Valerie Millar, Mark P. Kirk
  • Surface modification of magnetic particle pigments
    Patent number: 5868959
    Abstract: The invention is a surface modifier for magnetic pigments having the formula:(Ar).sub.n --R--PO.sub.3 H.sub.2 (I)where Ar represents an aryl group, R represents an aliphatic group of 1-6 carbons and n is an integer of 1 or more. The invention also includes magnetic recording media made using such surface modifiers.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: February 9, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Philip I. Mayo, Ian T. Morgan, Colin F. Norman, Robert J. D. Nairne