Patents by Inventor Ping H. Sih

Ping H. Sih 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 production of azomethines and alpha-haloacetanilides
    Patent number: 5852215
    Abstract: Aromatic azomethines are produced by continuous reaction of an aniline with a formaldehyde source, with continuous evaporation to remove residual water of reaction. The azomethine product may be further reacted, either continuously or in batch process, with a haloacetylating agent, and, additionally, with an aliphatic alcohol.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: December 22, 1998
    Assignee: Zeneca Limited
    Inventors: Kambiz Javdani, Louie A. Nady, Ping H. Sih, Gilbert Rodriguez