Patents by Inventor Robert A. K. Szmidt

Robert A. K. Szmidt 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).

  • Plant growth media comprising cross-linked hydrogel particles
    Patent number: 5382270
    Abstract: The invention provides a method of plant growing in which method one or more plants are grown in a growing medium comprising hydrogel particles charged with aqueous nutrient solution for the plant and plants, the growing medium being housed in a substantially water-impermeable container and the plants extending out of the container, and, when the water content within the hydrogel particles falls below a predetermined level, introducing further nutrient solution into the container.
    Type: Grant
    Filed: September 9, 1993
    Date of Patent: January 17, 1995
    Assignee: University of Strathclyde
    Inventors: Neil B. Graham, Robert A. K. Szmidt, Ralph C. Kirkwood
  • Hydroponic crop production
    Patent number: 5168655
    Abstract: Hydroponic substrates are disinfected in situ, prior to a crop production cycle, with a dilute aqueous solution containing hydrogen peroxide and at least one peracid having a ##STR1## group.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: December 8, 1992
    Assignee: Albright & Wilson Limited
    Inventors: Andrew A. Davidson, Robert A. K. Szmidt