Patents by Inventor William A. Perkins

William A. Perkins 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).

  • Vacuum bottle construction
    Patent number: 4200199
    Abstract: A vacuum bottle construction as disclosed in which the vacuum filter is formed from a pair of concentric thin wall metal cylinders. The cylinders are formed of a thin metallic material, such as mild steel, which in and of itself is so thin as to be unable to withstand the pressure differential of atmospheric pressure on one side and a substantial vacuum on the other side. To prevent collapse of the outer thin wall cylinder due to this pressure differential means are provided in the space between the cylinders bearing against the outer wall to provide a force opposing that of the pressure differential.
    Type: Grant
    Filed: September 1, 1977
    Date of Patent: April 29, 1980
    Assignee: Aladdin Industries, Incorporated
    Inventors: William A. Perkins, William J. Tanner