Patents Represented by Attorney J. A. Costello

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  • Hydroxy-functional oligomers for high solids coatings
    Patent number: 5952452
    Abstract: A high solids coating composition comprising a branched hydroxy-functional polyester oligomer and a curing agent; and the oligomer itself containing at least 20% by weight of the binder of at least one of the following tertiary acid ester end groups: ##STR1## where R.sub.1, R.sub.2 and R.sub.3 are independently selected from CH.sub.3 and CH.sub.2 OH; the composition being suitable as an automobile clearcoat or pigmented topcoat.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: September 14, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Armand Aerts, Anne DeMarre, Jozef Huybrechts, G. Todd Palmer
  • One-stage flotation purification of NaOH
    Patent number: 4277331
    Abstract: A process for purifying an aqueous solution of NaOH by removing suspended NaCl and Na.sub.2 SO.sub.4 impurities therefrom comprising bubbling a gas into the impurity-containing NaOH solution at a temperature above 16.degree. C. and up to about 36.degree. C.
    Type: Grant
    Filed: June 14, 1979
    Date of Patent: July 7, 1981
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Raymond H. Conageski