Patents by Inventor Frank B. Walden

Frank B. Walden 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).

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    Patent number: 4186870
    Abstract: A flag assembly includes a lateral projection at its lower end enabling flag raising by fingertip pressure. A spring biased rod includes an arm member contactable with the projection during door opening to automatically lower the flag. A link associated with the rod moves past the door hinge pin axis to lock the door open and also to close the door after initial manual door closing movement.
    Type: Grant
    Filed: July 5, 1978
    Date of Patent: February 5, 1980
    Inventor: Frank B. Walden