Patents by Inventor Jean P. LeCalvez

Jean P. LeCalvez 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).

  • Device for supplying a powdery product in gravimetrically metered amounts to a pneumatic line
    Patent number: 4669921
    Abstract: A gravimetric metering apparatus with a constant throughput is enclosed inside a sealed chamber and connected through the wall of the chamber, by a first pipe, to a pneumatic conveyor line operating under a pressure of n bars and, by a second pipe, to an intermittentently operated external loading hopper. The chamber is filled with gas under a pressure of n bars which is equal to that inside the pneumatic conveyor line.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: June 2, 1987
    Assignee: Charbonnages de France
    Inventors: Gerard Flament, Jean P. LeCalvez