Patents by Inventor Frederik Theijsmeijer

Frederik Theijsmeijer 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
  • Double flexing chain
    Patent number: 4150584
    Abstract: A block and bar chain of the trolley conveyor type includes a center link having U-shaped bushing inserts at the ends of the link. The inserts with the center link are respectively turnable on the pins; the center link is pivotable on either insert about a separate axis normal to that of the pins. The improved double flexure of the chain reduces the stress in the chain parts comprising the joint and in turn allows the center link and the inserts in particular to be of a molded plastic construction of the required configuration. The inserts have pivot and retaining means and their plastic construction permits their "snap-in" assembly.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: April 24, 1979
    Assignee: Rexnord Inc.
    Inventor: Frederik Theijsmeijer