Abstract: A coupler for animal collars characterized by a novel combination of a releasable locking member biased in a normally closed position which is in the form of a curved resilient strip. This strip is adapted to receive a pair of post members provided on a channel-like base member which in turn receives respective ends of the collar which are held on the posts until the strip member is removed. The strip member may be removed by depressing the center portion which elongates the strip and permits its removal from the posts and their flanged top.

Abstract: This invention relates to 3-(julolidinyl)-benz[d]-isothiazole-1,1-dioxide useful as an intermediate in the synthesis of certain 3,3-disubstituted-2,3-dihydrobenz[d]-isothiazole-1,1-dioxide dyes which find utility as, for example, photographic optical filter agents and filter agent precursors.

Abstract: This invention relates to 3-(phenyl/naphthyl)benz[d]isothiazole-1,1-dioxides wherein the phenyl or naphthyl substituent possesses an N-heterocyclic moiety in the para position. These compounds are useful as intermediates in the synthesis of certain 3,3-disubstituted-2,3-dihydrobenz[d]isothiazole-1,1-dioxide dyes which find utility as, for example, photographic optical filter agents and filter agent precursors.