Patents by Inventor Edward V. Cartwright

Edward V. Cartwright 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).

  • Key control of important security keys
    Patent number: 4939917
    Abstract: A secure holder for a key which provides for limited access to that key. A first and second plate retain a key securely therein and a wire and seal is used to inhibit access and determine if the key has been accessed. Also, a key ring holds the key to the first plate and a single pin holds the first and second plate together, in a pivotal relationship.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: July 10, 1990
    Inventor: Edward V. Cartwright