Patents by Inventor I. Roger Leatherman

I. Roger Leatherman 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).

  • Tungsten hexacarbonyl in plastic lenses
    Patent number: 4069168
    Abstract: Tungsten hexacarbonyl acts as a photochromic agent and an infrared absorber when incorporated in liquid allyl glycol carbonates, such as allyl diglycol carbonate, and polymerizates thereof. Photochromic, infrared-absorbing optical and ophthalmic lenses containing tungsten derived from tungsten hexacarbonyl are made.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: January 17, 1978
    Assignee: PPG Industries, Inc.
    Inventors: I. Roger Leatherman, Michael S. Misura