Patents by Inventor Arthur K. Hoffman

Arthur K. Hoffman 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).

  • Stabilization of resmethrin
    Patent number: 4220640
    Abstract: Resmethrin and 4,5-benzospiro[2,4]hepta-4,6-diene-1-carboxylic acid, .alpha.-cyano-m-phenoxybenzyl ester are stabilized against degradation with stabilizing amounts of nickel complexes of 2,2'-thiobis(p-alkylphenols).
    Type: Grant
    Filed: May 13, 1976
    Date of Patent: September 2, 1980
    Assignee: American Cyanamid Company
    Inventors: Arnold Zweig, Arthur K. Hoffman