Patents by Inventor Heinz Schiffl

Heinz Schiffl 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).

  • Method of and a device for sensing objects
    Patent number: 4473822
    Abstract: A single ultrasonic generator is employed for detecting objects, particularly copies processed in photographic devices. The sound-radiating surface of the generator is spaced apart from a reference plane about a distance equal to an integer multiple of half the wavelength of the ultrasonic waves. The changes of damping of the ultrasonic resonance circuit resulting from the acoustic load variations are measured in an electronic evaluation circuit.
    Type: Grant
    Filed: April 30, 1982
    Date of Patent: September 25, 1984
    Assignee: Agfa-Gevaert AG
    Inventor: Heinz Schiffl