Patents by Inventor Jim A. Nissmo

Jim A. Nissmo 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).

  • Method and apparatus for controlling the temperature in greenhouses
    Patent number: 4339074
    Abstract: Method and apparatus for controlling the temperature in greenhouses, the nominal value of the temperature being adjusted between a higher daytime temperature and a lower night temperature. In order that the plants in the greenhouse shall not be exposed to a shocklike reduction of the total energy supply to the plants if a considerable sunlight energy quantity has been supplied to the plants in the daytime, the nominal value of the night temperature is controlled in dependence of the sunlight energy quantity received by the plants, in such a manner that the night temperature is adjusted to a higher value at a higher sunlight energy quantity.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: July 13, 1982
    Inventors: Jim A. Nissmo, Jan A. Sundin, Lars B. Sjostrom
  • Method and apparatus of growing plants without soil
    Patent number: 4245433
    Abstract: For the control of the pH value of a nutrient solution for growing plants the pH value is increased by supplying nitrate nitrogen and is decreased by supplying ammonium nitrogen to the nutrient solution.
    Type: Grant
    Filed: June 12, 1979
    Date of Patent: January 20, 1981
    Inventors: Ernst H. S. Sjostedt, Jim A. Nissmo