Patents by Inventor William J. Siefert

William J. Siefert 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 coating the inside of pipe
    Patent number: 4515832
    Abstract: This is a method for coating the inside of a pipe with a wear-resistant material and is more specifically concerned with an improved production method for producing large size pipe.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: May 7, 1985
    Assignee: Rexnord, Inc.
    Inventors: Charles L. Roeder, William J. Siefert, Frederik Theijsmeijer
  • Apparatus for coating the inside of pipe
    Patent number: 4262627
    Abstract: This is an apparatus for coating the inside of a pipe with a wear-resistant material and is more specifically concerned with an improved production machine for producing large size pipe.
    Type: Grant
    Filed: April 6, 1978
    Date of Patent: April 21, 1981
    Assignee: Rexnord, Inc.
    Inventors: Charles L. Roeder, William J. Siefert, Frederik Theijsmeijer