Patents by Inventor Charles L. Swanson

Charles L. Swanson 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).

  • Preparation of graft polymer latexes by sonification
    Patent number: 3984361
    Abstract: Starch graft polymer latexes as well as processes for their preparations are disclosed. The starch graft latexes are water-dispersed grafted starch particles (300-1500 A in size) consisting of either (1) a cationic starch graft polymerized with up to 66% by weight of either nonionic or cationic vinyl monomers alone or with selected combinations thereof or (2) a nonionic starch graft polymerized with a cationic monomer alone or in combination with nonionic monomers. The latexes, having a range of properties, dry at 25.degree. C. or at higher temperatures to clear continuous films.
    Type: Grant
    Filed: May 30, 1975
    Date of Patent: October 5, 1976
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Lewis A. Gugliemelli, Charles L. Swanson, Charles R. Russell
  • Removal of heavy metal ions from wastewater
    Patent number: 3947354
    Abstract: Concentrations of undesirable heavy metals in industrial wastewater are reduced to below or very close to the most stringent aqueous discharge limits. This is accomplished by forming an insoluble metal-polyelectrolyte complex which can be easily and economically removed from the effluent.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: March 30, 1976
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Charles L. Swanson, Robert E. Wing, William M. Doane