Patents by Inventor Alvin E. Allen

Alvin E. Allen 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).

  • Process and apparatus for preparing double edge on flexible sheet material
    Patent number: 3978191
    Abstract: This invention relates to a process and apparatus for applying a double edge to any flexible sheetlike material by bending over a portion of the sheet edge on each side of said sheetlike material. The sheetlike material must then be cured or made rigid by heating. The entire process and the apparatus also is handled as an integral operation with the forming and curing of the flexible sheet.
    Type: Grant
    Filed: March 11, 1974
    Date of Patent: August 31, 1976
    Assignee: Baltimore Aircoil Company, Inc.
    Inventors: Alvin E. Allen, Merle I. Hall