Patents by Inventor Robert W. Maxwell, Jr.

Robert W. Maxwell, Jr. 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).

  • Process for separating 2,6-xylenol from a mixture of cresylic acids
    Patent number: 4013520
    Abstract: A mixture of cresylic acids containing a substantial amount of 2,6-xylenol is contacted with an ester-forming phosphorus compound in an amount in the range of 0.5 to 5.0 equivalents per equivalent of cresylic acids other than 2,6-xylenol. The temperature is in the range of 50.degree.-250.degree. C., and a catalyst may or may not be employed. Under these conditions, aryl phosphates are formed more rapidly from the cresylic acids other than the 2,6-xylenol. The substantially unreacted 2,6-xylenol is readily separated from the aryl phosphates.
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: March 22, 1977
    Inventor: Robert W. Maxwell, Jr.
  • Process for producing a mixture of isopropylnaphthalenes
    Patent number: 3962365
    Abstract: A mixture of monosubstituted and polysubstituted isopropylnaphthalenes is produced by treating naphthalene with concentrated sulfuric acid and propylene. Concentrated sulfuric acid is added to naphthalene in an amount of at least 3% based on the amount of naphthalene used, and at a temperature in the range of 150.degree. - 200.degree.C to form a mixture containing naphthalene sulfonic acids and naphthalene. Propylene is added to this mixture at a temperature of 150.degree. - 220.degree.C. The propylated mixture is neutralized with caustic and distilled to remove naphthalene and to produce a mixture of isopropylnaphthalenes.
    Type: Grant
    Filed: May 28, 1975
    Date of Patent: June 8, 1976
    Assignee: Koppers Company, Inc.
    Inventors: Robert M. Gaydos, Leonard F. Guziak, Robert W. Maxwell, Jr.