Patents by Inventor James P. Keltner

James P. Keltner 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).

  • Patent number: 4936436
    Abstract: A coin receiving device for use with coin operated vending machines which prevents the coin from leaving the customers hand and completely entering the device until it has been verified as a proper coin. Upon being validated as a proper coin, it is allowed to enter the device where it rolls downward, producing an electrical "coin accepted" pulse to the external coin counting or vending circuitry of the vending device. The need to reject the coin internally and return the bad coin to the customer is eliminated, and hence, the problems of jamming of coins inherent with this coin return process are also eliminated.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: June 26, 1990
    Inventor: James P. Keltner