Patents by Inventor Colin C. Duke

Colin C. Duke 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 the resolution of racemates using lactone esters
    Patent number: 4855446
    Abstract: Racemic carboxylic acids are resolved into their enantiomers using optically active enantiomers of four lactones as resolving agents. The four lactones are 2,3-isopropylidene-ribonic acid-1,4-lactone, 1,2-isopropylidene-glucofuranurono-3,6-lactone, 2-hydroxy-3,3-dimethyl-1,4-butyrolactone and 3,4-isopropylidene-arabino-1,5-lactone. Novel diastereoisomeric esters of the acids with the lactones are disclosed.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: August 8, 1989
    Assignee: The Sherwin Williams Company
    Inventors: Colin C. Duke, Robert J. Wells
  • 2,3-Isopropylidene ribonic acid, 1,4-lactones
    Patent number: 4501908
    Abstract: Racemic carboxylic acids are resolved into their enantiomers using optically active enantiomers of four lactones as resolving agents. The four lactones are 2,3-isopropylidene-ribonic acid-1,4-lactone, 1,2-isopropylideneglucofuranurono-3,6-lactone, 2-hydroxy-3,3-dimethyl-1,4-butyrolactone and 3,4-isopropylidene-arabino-1,5-lactone. Novel diastereoisomeric esters of the acids with the lactones are disclosed.
    Type: Grant
    Filed: March 1, 1982
    Date of Patent: February 26, 1985
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Colin C. Duke, Robert J. Wells