Patents by Inventor A. Lee Stautzenberger

A. Lee Stautzenberger 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).

  • Purification of diphenyl phthalates
    Patent number: 4868324
    Abstract: Crude diphenyl phthalates, including isomeric mixtures thereof which are prepared by reacting mixtures of isophthalic and terephthalic acids with phenol, preferably in the presence of an organotitanate, organozirconate, or organostannate catalyst, are purified by dissolving the crude phthalate in an organic solvent, contacting the resulting solution with dilute aqueous alkali to neutralize the ester, separating the resulting oil and aqueous phases, and thereafter recovering from the oil phase a purified diaryl phthalate of reduced color and low acidity.
    Type: Grant
    Filed: May 24, 1988
    Date of Patent: September 19, 1989
    Assignee: Celanese Engineering Resins, Inc.
    Inventors: A. Lee Stautzenberger, Ellen A. Langford, Edward E. Quick
  • Purification of diphenyl phthalates
    Patent number: 4803295
    Abstract: Color properties of crude phenolic esters of aromatic dicarboxylic acids are improved by subjecting the esters to hydrogenation in the presence of hydrogen and a hydrogenation catalyst.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: February 7, 1989
    Assignee: Hoechst Celanese Corporation
    Inventors: A. Lee Stautzenberger, Robert W. Kunkel
  • Synthesis of diphenyl phthlates
    Patent number: 4767881
    Abstract: Diphenyl esters of aromatic carboxylic acids are prepared in the presence of an organozirconium catalyst.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: August 30, 1988
    Assignee: Hoechst Celanese Corporation
    Inventor: A. Lee Stautzenberger
  • Purification of diphenyl phthalates
    Patent number: 4766236
    Abstract: Color properties of crude phenolic esters of aromatic dicarboxylic acids are improved by distilling the esters in the presence of a boron oxide compound.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: August 23, 1988
    Assignee: Hoechst Celanese Corporation
    Inventors: A. Lee Stautzenberger, Ellen A. Langford
  • Substituted pyrimido-[4,5-d]-pyrimidine compounds useful for repelling insects, rodents or animals from substrates
    Patent number: 4038394
    Abstract: Pest repellency afforded by the presence of an effective amount of 2,7-dioxo (or dithio) decahydropyrimido-[4,5-d]-pyrimidines; compositions and treatments therewith; and pest repellent structures.
    Type: Grant
    Filed: April 28, 1975
    Date of Patent: July 26, 1977
    Assignee: Celanese Corporation
    Inventors: Adin Lee Stautzenberger, Frank Stevens Wagner
  • Method for determining suitability of triorganophosphorus ligands for use in hydroformylation processes
    Patent number: 4009003
    Abstract: The purity, and thus suitability of triorganophosphorus ligands of the same chemical composition obtained from different sources for use in forming catalytic complexes for catalyzing hydroformylation reactions is determined by heating an admixture of the organophosphorus ligand and an aldehyde, measuring the amount of resultant condensation products, and comparing said amount to a standard.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: February 22, 1977
    Assignee: Celanese Corporation
    Inventors: Adin Lee Stautzenberger, James Leonard Paul
  • Epoxidation using phthalocyanine catalysts
    Patent number: 3931249
    Abstract: A process for the epoxidation of ethylenically unsaturated compounds with organic hydroperoxides using metal-free phthalocyanines or metal phthalocyanines as catalysts. Suitable metals include those of the metals Ni, Cu, Ag, Ti, V, Zr, Mo. Re, or U.
    Type: Grant
    Filed: February 13, 1974
    Date of Patent: January 6, 1976
    Assignee: Celanese Corporation
    Inventor: Adin Lee Stautzenberger