Patents Represented by Attorney Edward J. Whitfield

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  • Dehydrochlorination catalyst
    Patent number: 4144192
    Abstract: Increased selectivity to vinylidene chloride is obtained in the catalytic vapor phase dehydrochlorination of 1,1,2-trichloroethane by conducting the reaction in the presence of a cesium nitrate catalyst.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: March 13, 1979
    Assignee: PPG Industries, Inc.
    Inventor: Arthur E. Reinhardt, III
  • Hydrogenation of glycolic acid
    Patent number: 4141930
    Abstract: Glycolic acid is hydrogenated in the liquid phase in the presence of a catalyst consisting essentially of metallic cobalt and thorium oxide.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: February 27, 1979
    Assignee: PPG Industries, Inc.
    Inventor: Donald R. Nielsen
  • Preparation of sulfate free glycolic acid ester
    Patent number: 4140866
    Abstract: Sulfate is removed from glycolic acid, prepared by the sulfuric acid catalyzed carbonylation of formaldehyde and intended for use as an intermediate in the production of ethylene glycol by catalytic hydrogenation by treating the glycolic acid with alkali metal hydroxide or carbonate, and esterifying the glycolic acid; the alkali metal sulfate being substantially completely precipitated in and separated from the esterification product.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: February 20, 1979
    Assignee: PPG Industries, Inc.
    Inventor: Donald R. Nielsen
  • Chemical desizing of fiber glass fabric
    Patent number: 4139357
    Abstract: Sized fiber glass fabric is cleaned and desized by contacting the sized fabric with an oxidizing agent under alkaline conditions followed by treatment with an organic solvent.
    Type: Grant
    Filed: December 8, 1977
    Date of Patent: February 13, 1979
    Assignee: PPG Industries, Inc.
    Inventors: George L. Brodmann, Dudley K. Moses
  • Solubility stable encapsulated diperisophthalic acid compositions
    Patent number: 4094808
    Abstract: Disclosed is a solubility stable bleaching formulation in the form of an encapsulated core. The core comprises particles of tabular habit diperisophthalic acid (DPI) in admixture with particles of inorganic salt substantially more water-soluble than the diperisophthalic acid. The bleaching formulation maintains a high rate of solution in water after storage under conditions of temperature fluctuation.
    Type: Grant
    Filed: April 19, 1977
    Date of Patent: June 13, 1978
    Assignee: PPG Industries, Inc.
    Inventors: Dorothy A. Stewart, Bobby D. Ricketts, Charles H. Hoelscher
  • Separation of dichlorobenzene isomers
    Patent number: 4089909
    Abstract: Metadichlorobenzene is removed from mixed dichlorobenzene isomers by a liquid phase Friedel-Crafts catalyst assisted chlorination in the absence of benzene or monochlorobenzene.
    Type: Grant
    Filed: September 22, 1976
    Date of Patent: May 16, 1978
    Assignee: PPG Industries, Inc.
    Inventors: Joseph E. Milam, Warren E. Dean, Robert K. Gerdes
  • Preparation of monoperoxyphthalic acid
    Patent number: 4085133
    Abstract: Stable monoperoxyphthalic acid is prepared by reacting phthalic anhydride with a stoichiometric excess of concentrated hydrogen peroxide in the absence of basic catalyst in liquid halogenated hydrocarbon medium in which the monoperoxyphthalic acid product is insoluble.
    Type: Grant
    Filed: November 24, 1976
    Date of Patent: April 18, 1978
    Assignee: PPG Industries, Inc.
    Inventor: Robert G. Briody
  • Degreasing process using stabilized methylchloroform solvent
    Patent number: 4065323
    Abstract: The pH and acid acceptance of methylchloroform solvent is maintained by contact with a continuous phase of polyhydroxy alcohol.
    Type: Grant
    Filed: September 16, 1976
    Date of Patent: December 27, 1977
    Assignee: PPG Industries, Inc.
    Inventor: Charles L. Cormany