Patents by Inventor Robert J. Engelmann

Robert J. Engelmann 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).

  • Security timer for automatic garage door opener
    Patent number: 4463292
    Abstract: A security timer for a powered overhead garage door causes the garage door to close after it has been opened for a selected time interval. The security timer includes an oscillator that provides pulses. A counter counts the pulses and provides a binary output. A timer switch is engaged by the door when the door is fully open. Engagement of the timer switch signals the oscillator and counter to begin. When the desired number of pulses has been counted, a relay switch is closed for signaling the operator unit of the door to close the door.
    Type: Grant
    Filed: December 20, 1982
    Date of Patent: July 31, 1984
    Inventor: Robert J. Engelmann