Patents by Inventor Robert P. Shadwick

Robert P. Shadwick 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