Patents by Inventor Fredrik P. Glasser

Fredrik P. Glasser 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).

  • Fertilizer material from apatite
    Patent number: 4436546
    Abstract: Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100.degree. C. with alkali but world reserves are problematic. The invention treats apatite at 900.degree. C. with sodium aluminosilicate/carbonate and siliceous material in quantities to keep the composition in terms of CaO, SiO.sub.2, Na.sub.2 O and P.sub.2 O.sub.5 in or near the ternary system Ca.sub.2 SiO.sub.4 --Ca.sub.3 (PO.sub.4).sub.2 --CaNaPO.sub.4.
    Type: Grant
    Filed: July 30, 1982
    Date of Patent: March 13, 1984
    Assignee: National Research Development Corporation
    Inventors: Fredrik P. Glasser, Richard P. Gunawardane
  • Fertilizer material from apatite
    Patent number: 4363650
    Abstract: Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100 C. with alkali but world reserves are problematic. The invention treats apatite at 900 C. with sodium aluminosilicate/carbonate and siliceous material in quantities to keep the composition in terms of CaO, SiO.sub.2, Na.sub.2 O and P.sub.2 O.sub.5 in or near the ternary system Ca.sub.2 SiO.sub.4 --Ca.sub.3 (PO.sub.4).sub.2 --CaNaPO.sub.4.
    Type: Grant
    Filed: April 30, 1981
    Date of Patent: December 14, 1982
    Assignee: National Research Development Corporation
    Inventors: Fredrik P. Glasser, Richard P. Gunawardane