Patents by Inventor Robert D. Schwellenbach

Robert D. Schwellenbach 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).

  • Vehicle safety device for monitoring the operation of directional signal lamps
    Patent number: 3965456
    Abstract: A vehicle safety device for monitoring directional signal lamps comprises a plurality of directional signal monitor lights positioned on the dashboard of a motor vehicle, a monitor light being associated with each set of directional signal lamps with each monitor light being connected to a plurality of monitor diodes. Each monitor diode is connected downstream of a current detection apparatus connected to detect current flow through a predetermined signal lamp and in response to such current flow to close a switch, permitting current to flow from a directional signal power switch through the monitor diode to a monitor light, thereby indicating that the predetermined signal lamp is operational. An alarm apparatus is also provided to alert the operator when a signal lamp becomes inoperative.
    Type: Grant
    Filed: January 17, 1974
    Date of Patent: June 22, 1976
    Inventor: Robert D. Schwellenbach