Patents by Inventor David C. Attride

David C. Attride 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).

  • Isolation of phenyl ester salts from mixtures comprising sulfolane
    Patent number: 6498124
    Abstract: The invention relates to a process for isolating a phenyl ester salt from a mixture comprising sulfolane (tetrahydrothiophene-1,1-dioxide). The invention includes adjusting the temperature of a mixture comprising a phenyl ester salt and sulfolane to a temperature of about 100-150° C. This step leads to the formation of a mixture comprising a solid phenyl ester salt and sulfolane. Next, the solid phenyl ester salt is separated, while maintaining the temperature of the mixture at about 100-150° C. The invention also relates to a process that includes adding a sufficient amount of a solvent to a mixture comprising a phenyl ester salt and sulfolane to decrease the viscosity or the density of the mixture. The solvent added has a density less than about 1.20 g/cm3 at 100° C. or a viscosity of less than about 2.56 centipoise at 100° C. The embodiments of the invention may be used alone or in combination.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: December 24, 2002
    Assignee: Eastman Chemical Company
    Inventors: Kevin J. Fontenot, David C. Attride, Keith B. Terhune
  • Isolation of phenyl ester salts from mixtures comprising sulfolane
    Publication number: 20020040151
    Abstract: The invention relates to a process for isolating a phenyl ester salt from a mixture comprising sulfolane (tetrahydrothiophene-1,1-dioxide). The invention includes adjusting the temperature of a mixture comprising a phenyl ester salt and sulfolane to a temperature of about 100-150° C. This step leads to the formation of a mixture comprising a solid phenyl ester salt and sulfolane. Next, the solid phenyl ester salt is separated, while maintaining the temperature of the mixture at about 100-150° C. The invention also relates to a process that includes adding a sufficient amount of a solvent to a mixture comprising a phenyl ester salt and sulfolane to decrease the viscosity or the density of the mixture. The solvent added has a density less than about 1.20 g/cm3 at 100° C. or a viscosity of less than about 2.56 centipoise at 100° C. The embodiments of the invention may be used alone or in combination.
    Type: Application
    Filed: June 1, 2001
    Publication date: April 4, 2002
    Inventors: Kevin J. Fontenot,, David C. Attride, Keith B. Terhune
  • Process for the production of cyclopropanecarboxaldehyde
    Patent number: 5502257
    Abstract: Disclosed is a process for the preparation of cyclopropanecarboxaldehyde by the thermal isomerization of 2,3-dihydrofuran under superatmospheric pressure, e.g., at a temperature of about 300.degree. to 600.degree. C. and a pressure of about 3 to 345 bars absolute.
    Type: Grant
    Filed: February 21, 1995
    Date of Patent: March 26, 1996
    Assignee: Eastman Chemical Company
    Inventors: Shaowo Liang, Timothy W. Price, Timothy R. Nolen, Daniel B. Compton, David C. Attride