Patents by Inventor Alain Charoy

Alain Charoy 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 for detecting thickness variations in the wall of a tubular body which conducts electricity
    Patent number: 4947132
    Abstract: The method is based on the exploitation of the "skin effect" occuring in any current-conducting material as a function of the current frequency going through said material. A transformer (5) is supplied from a generator (2) and an amplifier (4) to produce the current intended to supply the tube (T) and to measure the voltage at the terminals of a shunt (6). This voltage which is characteristical of the energization current is amplified by an amplifier (8) and brought to the reference input of a phase correlation amplifier (1). The resistive component of the signal on the tube is then measured by said amplifier (1) by just measuring the signal phase component.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: August 7, 1990
    Assignee: Battelle Memorial Institute
    Inventors: Alain Charoy, Jacques Vermot-Gaud, Jean-Louis Prost, Michel Kornmann, Dieter Gold