Patents by Inventor Wen Shieh

Wen Shieh 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).

  • Cyclodextrin refining process
    Patent number: 5393880
    Abstract: Cyclodextrin is refined by performing a crystallization step in the presence of a hydrogen bond inhibitor. The hydrogen bond inhibitor includes a base in an amount to adjust the pH of the solution to 8 and above or a non-base such as urea, guanidium hydrochloride and sodium lauryl sulfate in an amount of 0.1% to 2%.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: February 28, 1995
    Assignee: American Maize-Products Company
    Inventors: Wen Shieh, Timothy Dailey, Allan Hedges
  • Process for separating cyclodextrin from a complex
    Patent number: 5371209
    Abstract: The process entails adding salt in an amount of 1% to 5% by weight slurry to an aqueous slurry of cyclodextrin-guest complex at a temperature of 100.degree. C. to 150.degree. C. for a period of 5 minutes to 2 hours and a pressure of 15 psia to 70 psia to prevent the slurry from boiling and to cause the complex to break apart. The individual cyclodextrin and guest are then recovered.
    Type: Grant
    Filed: June 15, 1993
    Date of Patent: December 6, 1994
    Assignee: American Maize-Products Company
    Inventors: Wen Shieh, Allan Hedges