Patents Assigned to The National Lime and Stone Co.
  • Patent number: 8404259
    Abstract: An inert dispersible granular substrate is suitable for use as a carrier for chemical agents. The granular substrate is comprised of one or more mineral components, the one or more mineral components having a bulk density of greater than about 70 pounds per cubic foot, one or more dispersibility additives; and one or more water soluble binders. The granular substrate has a bulk density of from greater than 55 pounds pcf to about 70 pcf, a water dispersibility of less than 5 minutes, a pH of from 6 to 8, and sufficient strength to survive formulation processing after 3 days of continuous exposure to a temperature of approximately 75° F. and a relative humidity of approximately 95%. Preferably, an active pesticide is applied to the dispersible granular substrate. The water dispersible granular substrates may be produced by forming a granular substrate admixture, pelletizing the admixture to form granular substrates, and drying the granular substrates.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: March 26, 2013
    Assignees: The National Lime and Stone Co., The Andersons, Inc.
    Inventors: James W. Welshimer, Timothy D. Birthisel
  • Patent number: 6613138
    Abstract: A manufactured granular substrate composition suitable for use as a carrier for active chemical agents. The composition includes one or more mineral components having a bulk density greater than about 70 pounds per cubic foot. The composition also contains about one or more light weight additives and one or more water soluble binders. The resulting manufactured granular substrate has a bulk density of less than about 55 pounds per cubic foot with a size guide number of about 75 to about 300.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: September 2, 2003
    Assignees: The National Lime and Stone Co., The Andersons Agriservices, Inc.
    Inventors: James W. Welshimer, Nadine C. Dunn, Timothy D. Birthisel
  • Patent number: 6231660
    Abstract: A manufactured granular substrate composition suitable for use as a carrier for active chemical agents. The composition includes about 65 wt % or more of one or more mineral components having a bulk density greater than about 70 pounds per cubic foot. The composition also contains about 5 wt % to about 25 wt % of one or more light weight additives and up to 20 wt % of one or more water soluble binders. The resulting manufactured granular substrate is readily dispersable in water and has a bulk density of less than about 55 pounds per cubic foot with a size guide number of about 100 to about 230.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: May 15, 2001
    Assignees: The National Lime and Stone Co., The Andersons, Inc.
    Inventors: James W. Welshimer, David L. Ashworth, Peter V. Cawlfield, Nadine C. Dunn, Gerald L. Gingrich, Karissa L. Fox, Kim W. Venable, Paul Weinstein, Timothy D. Birthisel