Patents by Inventor John R. Grubbe

John R. Grubbe 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 for determining volatile phosphorus in carbon
    Patent number: 4843015
    Abstract: A method and apparatus for determining the phosphorus content which can be volatilized in a solid carbon sample. The sample is heated in the presence of steam to produce a vaporous steam containing volatile phosphorus. Next, the vaporous stream is passed through a zinc oxide layer whereby the voliatle phosphorus is retained. A colored solution is formed upon adding to the zinc oxide layer a vanadate-molybdate reagent. Finnally, the intensity of the colored solution is determined by a spectrophotometer; and the phosphorus content is determined by comparison with a standard intensity graph.
    Type: Grant
    Filed: November 5, 1987
    Date of Patent: June 27, 1989
    Assignee: Westvaco Corporation
    Inventors: John R. Grubbs, Jr., Aravamuthan P. Sarathy, Robert C. Flowe
  • Soil conditioning fertilizer compound
    Patent number: 3940257
    Abstract: A soil conditioning and fertilizer composition and the process of producing it is disclosed, the composition composed of particulate seaweed intimately mixed with particulate tree bark.
    Type: Grant
    Filed: September 23, 1970
    Date of Patent: February 24, 1976
    Assignee: American Forest Industries Ltd.
    Inventors: Ian M. Sherwin, John R. Grubbe