Patents by Inventor Charles H. Ludwig

Charles H. Ludwig 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).

  • Cohesive fibrous mat for in-transit particulate control
    Patent number: 4492729
    Abstract: Particulate material is protected from dispersion during transportation by a cohesive fibrous mat comprised of the particulate material bound by cellulosic fibrous material and gelantinized starch.
    Type: Grant
    Filed: October 8, 1982
    Date of Patent: January 8, 1985
    Assignee: Georgia-Pacific Corporation
    Inventors: Wyburn G. Bannerman, Charles H. Ludwig
  • Lignin composition and a process for its preparation
    Patent number: 4017475
    Abstract: Aminoalkylated hydroxyphenylated lignosulfonate is described. The composition is prepared by reacting a hydroxyphenylated lignosulfonate with a nitrogen compound and an aldehyde.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: April 12, 1977
    Assignee: Georgia-Pacific Corporation
    Inventor: Charles H. Ludwig
  • Cationic bituminous emulsions
    Patent number: 4017419
    Abstract: A cationic bitumen emulsion stabilized with a polyamine-lignin reaction product is described.
    Type: Grant
    Filed: January 2, 1976
    Date of Patent: April 12, 1977
    Assignee: Georgia-Pacific Corporation
    Inventors: Charles H. Ludwig, Larry B. Fiske
  • Plywood adhesive and use thereof
    Patent number: 3957703
    Abstract: A phenolic-aldehyde plywood adhesive containing as an extender a water-insoluble, acid-polymerized lignosulfonate.
    Type: Grant
    Filed: February 25, 1974
    Date of Patent: May 18, 1976
    Assignee: Georgia-Pacific Corporation
    Inventors: Charles H. Ludwig, Albert W. Stout, deceased