Patents by Inventor Arvo Wahlberg

Arvo Wahlberg 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 of producing a phosphorus fertilizer soil conditioner
    Patent number: 4804401
    Abstract: A method for producing combined phosphorus fertilizer and soil conditioner in which phosphate rock and, as reaction matter, organic acidic matter are used. In a method according to the invention, the acidic mass is organic, for instance, bark waste, peat, waste fiber from a cellulose production plant or paper mill, sawdust or similar matter.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: February 14, 1989
    Inventors: Arvo Wahlberg, deceased, by Anna-Maija Wahlberg, legal representative
  • Production method of combined phosphorus fertilizer and soil conditioner
    Patent number: 4710219
    Abstract: A method for producing combined phosphorus fertilizer and soil conditioner in which phosphate rock and, as reaction matter, organic acidic matter are used. In a method according to the invention, the acidic mass is organic, for instance, bark waste, peat, peat mud or waste fibre from a cellulose production plant or the solid component of communal sewage.
    Type: Grant
    Filed: April 17, 1986
    Date of Patent: December 1, 1987
    Inventors: Arvo Wahlberg, deceased, by Anna-Maija Wahlberg, heiress
  • Method for producing fertilizer from tree ash and softwood bark or from other tree waste
    Patent number: 4571254
    Abstract: The present invention relates to a method for producing fertilizer from softwood bark and/or tree waste in which the softwood bark is decomposed at a temperature of 70.degree. . . . 140.degree. C., when the protective substances detrimental to plants can be eliminated. Bark or tree ash is added to the ground bark mass in high pressure along with urea and, if necessary, with phosphorus and the product is finally granulated. Peat is added to the bark mass at the first stage of the process in order to increase granulation capacity and nutrient storage capacity. The decomposition temperature depends on the age of the mass. All urea is added in the end of the process in order to avoid the danger of toxicity.
    Type: Grant
    Filed: November 8, 1984
    Date of Patent: February 18, 1986
    Inventor: Arvo Wahlberg