Patents Assigned to Chatwins Group, Inc.
  • Inert-metal lined, seamless steel-body cylinder
    Patent number: 6089399
    Abstract: A seamless steel-body cylinder, suitable for storing ultra-high purity gases, has an inert metal lining. The cylinder lining is preferably nickel and completely covers the interior surface of the steel cylinder body, preventing the stored gas from making any contact and reacting with the steel cylinder body. The surface of the inert metal lining is conditioned to be smooth, preferably to 15 R.sub.a or better. The cylinder body is preferably externally threaded to secure end closure devices to the cylinder body.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: July 18, 2000
    Assignee: Chatwins Group, Inc.
    Inventors: John Wayne Felbaum, David William Treadwell, Joseph Tassone