Patents by Inventor Jacques L. Cretel

Jacques L. Cretel 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 making compound pipes for conveying various fluids and pipe obtained by this method
    Patent number: 4789007
    Abstract: A method of making a tube for carrying various fluids and materials, the tube comprising from the inside to the outside a layer of impervious plastics material, a first layer of glass fibers connected to the impervious layer, a layer of electrically conducting material and a second layer of glass fibers, the three lastly named layers being impregnated with a resin polymerized through heating of the layer of electrically conducting material which may be a heating metal wire resistor.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: December 6, 1988
    Inventor: Jacques L. Cretel