Total Nitrogen Determined Patents (Class 436/114)
As part of an elemental analysis (Class 436/115)
  • Digestion process
    Patent number: 4645746
    Abstract: An improved process for quantitatively determining nitrogen content or other elemental content in a wide variety of materials. The process avoids the use of conventional catalysts, is simpler and faster than previous techniques, and results in a very high degree of accuracy. The process involves the use of a hydrogen peroxide which is added to the digest continuously, while the digest is boiling, while refluxing with a fractionating column. The digestion process also enables quantitative determination of various elements other than nitrogen.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: February 24, 1987
    Assignee: Hach Company
    Inventor: Clifford C. Hach
  • Gas analyzer or the like
    Patent number: 4526755
    Abstract: An analyzer for natural gas to determine the existence of and concentration of wanted and unwanted sulfur compounds and odorizing agents.
    Type: Grant
    Filed: February 22, 1982
    Date of Patent: July 2, 1985
    Assignee: International Telephone & Telegraph Corporation
    Inventors: Arthur L Vincent, James R. Robinson, Ernst R. Ginkel