Patents by Inventor Des Topper

Des Topper 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).

  • Process and apparatus for welding a hollow structure, such as a container or a tube, with inerting of its internal structure
    Patent number: 6281464
    Abstract: First and second sub-parts are brought into contact with each other so as to form an unwelded hollow structure defining an internal volume. The internal volume of the hollow structure is inerted by introducing an inerting gas mixture into the hollow structure, the inerting gas mixture comprising from 93% to 99.8% nitrogen and from 0.2% to 7% oxygen and being produced by air permeation by means of one or more membrane modules. The first and second sub-parts are arc welded together so as to form a welded hollow structure.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: August 28, 2001
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Des Topper