Perhydroxamate Esters Or Chalcogen Analogues Thereof (i.e., Compounds Having The -c(=x)-nh-x-x- Group, Wherein The X's Are The Same Or Diverse Chalcogens And Substitution May Be Made For Hydrogen Only, And Wherein The Terminal X Is Bonded Directly To Carbon, Which Carbon May Be Single Bonded To Any Atom But May Be Multiple Bonded Only To Carbon) Patents (Class 560/311)