Patents by Inventor Richard Lynn Purgason

Richard Lynn Purgason 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 preparation of cyclohexanone oxime
    Patent number: 3991115
    Abstract: This invention relates to a process for the production of cyclohexanone oxime by reacting cyclohexanone with excess aqueous hydroxylamine in the presence of excess ammonia. More specifically, the invention relates to improving yields of the oxime while reducing undesirable by-product formation by use of two or more stages of reaction with correlated adjustment of reaction conditions in each stage. The invention also involves improved recovery of the unreacted hydroxylamine reactant for recycle in the process.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: November 9, 1976
    Assignee: Allied Chemical Corporation
    Inventor: Richard Lynn Purgason