Patents by Inventor Duncan W. Frew

Duncan W. Frew 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).

  • Method of coating a carbon coated magnetic recording medium surface with a fluoropolymer lubricant
    Patent number: 5143787
    Abstract: Magnetic recording media wherein the record surface is coated with an isocyanate lubricant (and, preferably, a supercoat of like lubricant), such lubrication being adapted to inhibit spin-off and like depletion, despite frequent head-contact, while exhibiting good durability, wear resistance and recording characteristics over extended life (computer applications).
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: September 1, 1992
    Assignee: Unisys Corp.
    Inventors: Duncan W. Frew, Robert P. Shadwick
  • Anti-spin-off coating for disc records
    Patent number: 5037710
    Abstract: Magnetic recording media wherein the record surface is coated with an isocyanate lubricant (and, preferably, a supercoat of like lubricant), such lubrication being adapted to inhibit spin-off and like depletion, despite frequent head-contact, while exhibiting good durability, wear resistance and recording characteristics over extended life (computer applications).
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: August 6, 1991
    Assignee: Unisys Corp.
    Inventors: Duncan W. Frew, Robert P. Shadwick
  • Surface lubricants for disc record
    Patent number: 4797303
    Abstract: Magnetic recording media wherein the record surface is coated with an isocyanate lubricant (and, preferably, a supercoat of like lubricant), such lubrication being adapted to inhibit spin-off and like depletion, despite frequent head-contact, while exhibiting good durability, wear resistance and recording characteristics over extended life (computer applications).
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: January 10, 1989
    Assignee: Unisys Corp.
    Inventors: Duncan W. Frew, Robert P. Shadwick
  • Preparation of magnetic coating
    Patent number: 4717493
    Abstract: A magnetic coating composition is disclosed of the type having magnetic particles dispersed in a resin binder. The improvement comprises the use of a solvent system including a dibasic ester wherein the solvent system has an initial Hansen three-dimensional solubility parameter range of approximately 10.5 to 11.0 and a Hansen three-dimensional solubility parameter range of approximately 9.3 to 10.0 after approximately 99% of the solvent has been evaporated from the binder.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: January 5, 1988
    Assignee: Unisys Corporation
    Inventors: Duncan W. Frew, Zorro Stefanini, Edward A. Schnee, Leo di Ricco
  • Method to disperse fine solids without size reduction
    Patent number: 4547534
    Abstract: The present invention is a method to disperse fine solids in a resin binder matrix by use of a sand mill having non-metallic discs and containing zirconium oxide milling media. The method of the invention will disperse the fine solids without reduction of the size of the fine solids or contamination to the dispersion by fines of the zirconium oxide milling media.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: October 15, 1985
    Assignee: Memorex Corporation
    Inventors: Leo di Ricco, Edward Schnee, Zorro Stefanini, Duncan W. Frew
  • Magnetic coating composition
    Patent number: 4419257
    Abstract: A magnetic coating composition is disclosed of the type having magnetic particles dispersed in a resin binder. The improvement comprises the use of a solvent system including a dibasic ester wherein the solvent system has an initial Hansen three-dimensional solubility parameter range of approximately 10.5 to 11.0 and a Hansen three-dimensional solubility parameter range of approximately 9.3 to 10.0 after approximately 99% of the solvent has been evaporated from the binder.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: December 6, 1983
    Assignee: Memorex Corporation
    Inventors: Duncan W. Frew, Zorro Stefanini, Edward A. Schnee, Leo di Ricco
  • Magnetic coating compositions
    Patent number: 4092256
    Abstract: A coating composition for use in the preparation of magnetic recording media is described. The composition contains finely divided magnetic particles dispersed in an organic solvent, containing in solution a hydroxyl group containing polymer having an OH number between about 100-500, a polyether urethane elastomer, an aliphatic polyisocyanate and a copper containing chelate catalyst, the organic portion of said chelate being of the general chemical structure ##STR1## wherein R and R' can be the same or different and represent alkyl groups containing 1-18 carbon atoms and aromatic groups, both substituted and unsubstituted.
    Type: Grant
    Filed: December 22, 1976
    Date of Patent: May 30, 1978
    Inventors: Keith S. Goodson, Duncan W. Frew