Patents by Inventor Charles E. Bardsley

Charles E. Bardsley 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).

  • Nutrient compositions, methods and processes
    Patent number: 4219349
    Abstract: Plant nutrient compositions comprising various plant nutrients attached to calcined clay are provided as well as methods for their preparation and processes for their use.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: August 26, 1980
    Assignee: Mallinckrodt, Inc.
    Inventor: Charles E. Bardsley
  • Polyurethane plant growth medium
    Patent number: 3979198
    Abstract: A plant growth medium is disclosed having a polyurethane matrix with at least 40% and preferably 50 to 55% open cells, and from about 36% to about 50% (and more for example 60%) by weight of a granular filler dispersed throughout the polyurethane matrix, which filler comprises about 69% to about 78% by weight of clay of relatively high cation-exchange capacity, such as a calcium-hydrogen montmorillonite clay, and from about 22% to about 31% by weight plant nutrients and their carriers.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: September 7, 1976
    Assignee: Agritec, Co.
    Inventor: Charles E. Bardsley