Patents by Inventor Cenek H. Vrba

Cenek H. Vrba 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).

  • Insect control compositions
    Patent number: 5830512
    Abstract: The invention provides insect control compositions comprising aqueous dispersions of a hydrophobic substance and a hydrophilic substance. The hydrophobic substance is insecticidal or insect-deterring and can be silicon dioxide. The hydrophilic component increases the physico-chemical stability of the dispersion and modifies the textural, visual and/or olfactory characteristics of surfaces to which the compositions are applied; it can be a powdered or finely-divided organic or inorganic substance. The compositions can be applied to plant surfaces by spraying.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: November 3, 1998
    Inventor: Cenek H. Vrba
  • Insecticides
    Patent number: 5122518
    Abstract: Insects are combatted by treating the insects with a pyrogenically produced and hydrophobic silica. The insects can be sprayed with an aqueous dispersion of the pyrogenically produced and hydrophobic silica. Alternatively, the insects can be dusted with the silica in powdery form.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: June 16, 1992
    Inventor: Cenek H. Vrba