Patents by Inventor Alfred A. Elson

Alfred A. Elson 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).

  • Apparatus and method for automatic garage door operation
    Patent number: 4939434
    Abstract: Garage door controllers are improved by means to automatically close the doors after a preselected delay time, once they have been opened.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: July 3, 1990
    Inventor: Alfred A. Elson