Patents by Inventor Brien M. Thomas

Brien M. Thomas 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).

  • Treatment of water
    Patent number: 4874526
    Abstract: A process for treating water which comprises adding to the water (a) from 1 to 50 ppm of a phosphonium compound of the formula: ##STR1## in which R represents C.sub.1 -C.sub.6 groups which are unsubstituted or substituted by a cyano, hydroxy, esterified hydroxy or aryl group, R.sub.1 represents a C.sub.8 -C.sub.18 alkyl group and X represents chlorine or bromine, and optionally (b) from 0.1 to 100 ppm of an anionic water treatment agent such as a scale or corrosion inhibiting agent.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: October 17, 1989
    Assignee: Ciba-Geigy Corporation
    Inventors: Reinhardt Grade, Brien M. Thomas