Patents by Inventor John Gleason Donaldson

John Gleason Donaldson 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).

  • Glass for metal seal
    Patent number: 4071658
    Abstract: A composite metallic article for effecting a seal with glass, said article comprising a nickel-iron alloy core portion, a low carbon steel alloy sheath portion bonded to the core, and a uniformly thick shell portion of a glass-wetting material bonded about the sheath. A method for making the article is also disclosed.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: January 31, 1978
    Assignee: GTE Sylvania Incorporated
    Inventors: Paul Millard Phillips, John Gleason Donaldson