Patents by Inventor D. C. Caldwell

D. C. Caldwell 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).

  • Beverage container opener
    Patent number: D334123
    Type: Grant
    Filed: March 19, 1981
    Date of Patent: March 23, 1993
    Assignee: Caldwell Construction Corporation
    Inventors: Walter P. Barclay, D. C. Caldwell