Patents by Inventor David Rogers Crosby

David Rogers Crosby 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 balloons and method for making same
    Patent number: 4026499
    Abstract: A glass balloon that floats in air. An assembly of glass balloons that form a slab of foam that floats in air. A process for making glass balloons employing: two nested furnaces, pre-heated helium, a moving furnace, and a refrigerated seal-off chamber.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: May 31, 1977
    Inventor: David Rogers Crosby