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Various patents have been issued in the United States and other countries for LZW and similar algorithms. LZ78 was covered by by Lempel, Ziv, Cohn, and Eastman, assigned to Sperry Corporation, later Unisys Corporation, filed on August 10, 1981. 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.