Patents Assigned to The President and Trustees of the Miami University
  • Process for the spectrophotometric measurement of lithium ion employing a chromogenic aza-12-crown-4- ether
    Patent number: 4734376
    Abstract: Chromogenic aza-12-crown-4 ethers which can be used for the spectrophotometric determination of lithium ion in aqueous solutions are disclosed. The compounds of the invention are particularly useful for the analysis of Li.sup.+ in the presence of Na.sup.+, a situation common in biological and geological systems. The compounds [e.g., 1-(2-oxy-5-nitrobenzyl)-1-hydro-1-aza-4,7,10-trioxacyclododecane], their methods of manufacture, and methods of utilizing the compounds for the analysis of lithium are disclosed.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: March 29, 1988
    Assignee: The President & Trustees of the Miami University
    Inventors: Gilbert E. Pacey, Ken-ichi Sasaki
  • Method of detecting potassium ions using trifluoromethyl-substituted chromogenic crown ethers
    Patent number: 4711853
    Abstract: Two novel trifluoromethyl-substituted chromogenic crown ethers are disclosed, 4'-(2",6"-dinitro-4"-trifluoromethylphenyl) aminobenzo-15-crown-5 and 4'-(2",4"-dinitro-6"-trifluoromethylphenyl) aminobenzo-15-crown 5. These compounds are useful as reagents for the extraction and spectrophotometric determination of potassium in the presence of sodium. Reagent solutions of these compounds and methods of utilizing the reagents for the analysis of potassium are disclosed and claimed.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: December 8, 1987
    Assignee: The President and Trustees of the Miami University
    Inventors: Gilbert E. Pacey, Bernard P. Bubnis
  • Chromogenic aza-12-crown-4 ethers and method of using same for the detection of lithium
    Patent number: 4659815
    Abstract: Chromogenic aza-12-crown-4 ethers which can be used for the spectrophotometric determination of lithium ion in aqueous solutions are disclosed. The compounds of the invention are particularly useful for the analysis of Li.sup.30 in the presence of Na.sup.+, a situation common in biological and geological systems. The compounds [e.g., 1-(2-oxy-5-nitrobenzyl)-1-hydro-1-aza-4,7,10-trioxacylclododecane], their methods of manufacture, and methods of utilizing the compounds for the analysis of lithium are disclosed and claimed.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: April 21, 1987
    Assignee: The President and Trustees of the Miami University
    Inventors: Gilbert E. Pacey, Ken-ichi Sasaki
  • Trifluoromethyl-substituted chromogenic crown ethers and methods of using same
    Patent number: 4436923
    Abstract: Two novel trifluoromethyl-substituted chromogenic crown ethers are disclosed, 4'-(2",6"-dinitro-4" trifluoromethylphenyl) aminobenzo-15-crown-5 and 4'-(2",4"-dinitro-6"-trifluoromethylphenyl) aminobenzo-15-crown-5. These compounds are useful as reagents for the extraction and spectrophotometric determination of potassium in the presence of sodium. The compounds, their methods of manufacture, and methods of utilizing the compounds for the analysis of potassium are disclosed and claimed.
    Type: Grant
    Filed: June 7, 1982
    Date of Patent: March 13, 1984
    Assignee: The President and Trustees of the Miami University
    Inventors: Gilbert E. Pacey, Benard P. Bubnis