Patents by Inventor L. Roy Bunnell

L. Roy Bunnell 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 for producing thin graphite flakes with large aspect ratios
    Patent number: 5186919
    Abstract: A method for making graphite flakes of high aspect ratio by the steps of providing a strong concentrated acid and heating the graphite in the presence of the acid for a time and at a temperature effective to intercalate the acid in the graphite; heating the intercalated graphite at a rate and to a temperature effective to exfoliate the graphite in discrete layers; subjecting the graphite layers to ultrasonic energy, mechanical shear forces, or freezing in an amount effective to separate the layes into discrete flakes.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: February 16, 1993
    Assignee: Battelle Memorial Institute
    Inventor: L. Roy Bunnell