Two US patents were issued for the LZW algorithm: by Victor S. Miller and Mark N. Wegman and assigned to IBM, originally filed on June 1, 1983, and by Welch, assigned to Sperry Corporation, later Unisys Corporation, filed on June 20, 1983.
На LZW в США были выданы два патента: , принадлежащий IBM, и патент Велча (выдан 20 июня 1983 года), принадлежащий Sperry Corporation, позднее перешедший к Unisys Corporation.