Patents by Inventor Paul Frelau

Paul Frelau 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).

  • Explosive-forming device for the obturation of a pipe by compression
    Patent number: 4140041
    Abstract: A chamber formed at the lower end of a jack piston is made pressure-tight by means of a seal between the lateral walls of the piston and the jack cylinder and contains a gunpowder cartridge for actuating the jack. Two members located on each side of the pipe to be obturated by compression are intended to be driven together by firing the cartridge. One member is rigidly fixed to the jack piston and guided freely in translational motion by means of tie-bolts which serve to secure the other member to the jack cylinder.
    Type: Grant
    Filed: April 21, 1977
    Date of Patent: February 20, 1979
    Assignee: Commissariat a l'Energie Atomique
    Inventor: Paul Frelau