Patents by Inventor Rene Henri Droin

Rene Henri Droin 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).

  • Tubular exchanger
    Patent number: 4071083
    Abstract: A tubular exchanger for operations under conditions of heat and pressure comprising a set of tubes made of ferritic steel having the following composition:C .ltoreq. 0.010%,Cr 25 to 30%,Mo < 4%.The tubes are provided at each end with relatively short ferrules of austenitic stainless steel which are welded to the tubes.
    Type: Grant
    Filed: March 18, 1976
    Date of Patent: January 31, 1978
    Assignee: Creusot-Loire
    Inventor: Rene Henri Droin