Patents by Inventor Delbert J. Campbell

Delbert J. Campbell 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 for making a composite to carbon steel joint
    Patent number: 5240168
    Abstract: An improved method for making a composite tube (10) to a carbon steel tube (16) joint or a composite tube (10) to a carbon steel header (50) joint is achieved by specially preparing the composite tube (10) by removing the cladding (12) from one end (24) to a predetermined length to provide base carbon steel material (14). The end (24) of the composite tube has cladding (12) tapered at a predetermined angle. This end (24) is then expanded. The composite tube (10) is then welded to the carbon steel tube (16) with fewer weld passes while also eliminating the stainless steel weld pass.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: August 31, 1993
    Assignee: The Babcock & Wilcox Company
    Inventors: Antonio Lopez, Delbert J. Campbell