Patents by Inventor Daniel B. Pendergrass, Jr.

Daniel B. Pendergrass, Jr. 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).

  • Polyfunctional aziridine crosslinking agents for aqueous magnetic recording media binder
    Patent number: 4490505
    Abstract: In the manufacture of magnetic recording media, coatings are applied from water-borne dispersions of inorganic particles, a polymer containing functional groups and an agent for crosslinking the polymer, the crosslinking agent being a polyfunctional aziridine such as ##STR1##
    Type: Grant
    Filed: March 16, 1981
    Date of Patent: December 25, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Daniel B. Pendergrass, Jr.
  • Plunger assembly
    Patent number: 4087181
    Abstract: A plunger assembly for pressing together two smooth layers of material against a firm planar supporting surface without entrapping air between the layers. The assembly includes a soft resilient pad having adjacent surfaces disposed at an obtuse angle and meeting at a ridge. The pad is pressed against the material to first engage the ridge and then the adjacent surfaces progressively outwardly from the ridge to sweep air from between the layers of the material.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: May 2, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jerry L. Alexander, Daniel B. Pendergrass, Jr.