US Patents

UP-1 “Apparatus and Method for Controlling Crosspolarization of Signals in A Frequency Reuse System”, U. S. Patent No. 4, 292, 685 on Sept. 29, 1981

UP-2 “Frequency or Time Domain Speech Scrambling Technique and System which Does Not Require Any Frame Synchronization”, U. S. Patent No. 4, 591, 673, issued on May 27, 1986

UP-3 “Frequency or Time Domain Speech Scrambling Technique and System which Does Not Require Any Frame Synchronization”, U. S. Patent No. 4, 750, 205, issued on June 7, 1988

UP-4 “Mandarin Speech Input Method for Chinese Computers and A Mandarin Speech Recognition Machine”, U. S. Patent No. 5, 220, 639, issued on June 15, 1993

UP-5 “System and Method of Intelligent Mandarin Speech Input for Chinese Computers”, U. S. Patent No. 5, 787, 230, issued on July 28, 1998

UP-6 “System and Method of Intelligent Mandarin Speech Input for Chinese Computers”, U. S. Patent No. 6,067,520, issued on May 23, 2000

UP-7 “Method for Speech-based Information Retrieval in Mandarin Chinese”, U. S. Patent No. 7,324,935, issued on January 29, 2008