BASEL, Switzerland – Arch Chemicals Inc. has reached an agreement in which Sumitomo Seika Chemicals Co. Ltd. of Japan has licensed Arch under certain patents in the United States, Europe, Japan and China covering an advanced method of manufacturing 1, 2 benzisothiazolin 3-one.

Under the agreement, Arch has the right to sub-license the technology to third parties, and to enforce the licensed patents against direct and indirect infringement.