Patents by Inventor Joseph Sawdai

Joseph Sawdai 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).

  • Yankee Dryer and method of fabrication
    Patent number: 4320582
    Abstract: A Yankee Dryer used in drying a web of paper or like materials in which all structural components are fabricated of weldments of steel plate and forgings and in which the outer shell is formed of a weldment of steel plates expanded to roundness and machined to final dimensions. All primary welds are subject to X-ray inspection. The dryer is of lighter weight than the usual cast iron Yankee Dryers, yet designed to withstand substantially higher steam pressure within the shell.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: March 23, 1982
    Assignee: United States Steel Corporation
    Inventors: Karl H. Klippstein, Joseph Sawdai, Charles A. Schacht, Charles G. Schilling