Patents by Inventor Robert A. Kahl, Sr.

Robert A. Kahl, Sr. 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).

  • Infrared detection and alarm system for bottom shelf of shopping cart
    Patent number: 6542079
    Abstract: An infrared detection and alarm system for the bottom shelf of shopping carts having attached to the bottom shelf an infrared emitter which shall emit therefrom infrared light which shall be received by an infrared detector when no merchandise is located on the bottom of the cart and if a piece of merchandise is located on the bottom shelf the light shall be interrupted. Upon interruption of the light, a transmitter shall communicate a code to a receiver mounted on the checkout stand at which point said receiver shall activate an LED warning light to communicate to the sales clerk the presence of merchandise on the bottom shelf of the shopping cart.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: April 1, 2003
    Inventor: Robert A. Kahl, Sr.