Acyclic Carbon, Carboxamide And Chalcogen Or An Additional Acyclic Carbon, All Bonded Directly To The Same Benzene Ring Patents (Class 534/871)
  • Hardness indicator composition and method of water hardness analysis
    Patent number: 6599748
    Abstract: A hardness indicator composition, and a method of water hardness analysis, capable of measuring hardness even with higher-hardness water without requiring titration by a two-liquid system. The hardness indicator composition is formulated of a metal indicator with a desensitizer added thereto.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: July 29, 2003
    Assignees: Miura Co., Ltd., Miura Institute of Research & Development Co. Ltd.
    Inventors: Junichi Nakajima, Keita Mizogami, Yuuji Ukena
  • Calcium complexing dyes and their use in analytical compositions, elements and methods
    Patent number: 4795712
    Abstract: Novel chromogenic derivatives of 1,2-bis-(o-aminoaryloxy)ethane-N,N,N',N'-tetraacetic acid are useful for the determination of calcium ions in both solution and dry assays. These compounds comprise a dye moiety which is directly conjugated to the acetic acid substituted-nitrogen atom and which enables the compounds to exhibit maximum absorbance at a wavelength generally greater than 400 nm before complexation. When the compounds are complexed with calcium ions, the absorbance shifts to a shorter wavelength.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: January 3, 1989
    Assignee: Eastman Kodak Company
    Inventors: John L. Toner, Bruce J. Murray, Bruce E. Babb, Michael W. Sundberg