Patents by Inventor Norman W. Pruitt

Norman W. Pruitt 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).

  • Controlled release composition and method of manufacturing same
    Patent number: 4975108
    Abstract: Controlled release compositions are manufactured by subjecting cellulosic pulp rejects to a dewatering operation to remove approximately 25% of the water; flash-drying the obtained partially dewatered rejects, causing the rejects to expand and become porous; adding an additive material to impregnate the expanded and porous cellulosic material, and drying. The cellulosic material holds or retains the additive for delayed release. The compositions have good stability and structural integrity.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: December 4, 1990
    Inventor: Norman W. Pruitt
  • Cellulosic-based particulate insulation and method of manufacturing same
    Patent number: 4755225
    Abstract: Flame and combustion retardant insulative materials are manufactured by subjecting cellulosic pulp rejects to a dewatering operation to remove approximately 25% of the water; flash-drying the obtained partially dewatered rejects, causing the rejects to expand and become porous; applying a flame or combustion retardant material to impregnate and coat the expanded and porous cellulosic material, and drying. The thus impregnated and coated cellulosic materials have high insulative values while being highly resistant to flame and smoldering combustion.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: July 5, 1988
    Inventor: Norman W. Pruitt