Patents by Inventor Andrew J. Fielder

Andrew J. Fielder 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).

  • Producing sulphur-nitrogen groups
    Patent number: 4268491
    Abstract: Compounds containing sulphur-nitrogen groups, such as S.sub.4 N.sub.4, S.sub.5 N.sub.5.sup.+ salts and poly(sulphur nitride), are made by reducing S.sub.4 N.sub.3 Cl or related compounds with anions (e.g. iodide) or metals (e.g. silver). Poly(sulphur nitride) may be made by passing S.sub.4 N.sub.3 Cl vapor or S.sub.5 N.sub.5 FeCl.sub.4 vapor through sulphidized silver wool and condensing the vapor.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: May 19, 1981
    Assignee: National Research Development Corporation
    Inventors: Arthur J. Banister, Andrew J. Fielder, Zdenek V. Hauptman, Nigel R. M. Smith