Patents by Inventor Paul Ruehle

Paul Ruehle 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 of preparing an isothiocyanate intermediate used in the preparation of xylazine
    Patent number: 5043442
    Abstract: A process for preparing 2,6-dimethylphenylisothiocyanate comprises the steps of dissolving 2,6-dimethylaniline in carbon disulfide and ammonium hydroxide to form a dithiocarbamate salt. The salt is reacted with ethyl chloroformate to form 2,6-dimethylphenylisothiocyanate, which may thereafter be reacted with 3-amino-1-propanol and subsequently cyclized, by treating with hydrochloric acid, to form xylazine.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: August 27, 1991
    Assignee: Chemsyn Science Laboratories
    Inventors: Paul Ruehle, Amy M. Bunker