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3,292,086 December 13, 1966 System for Converting a Train of Binary Zeroes to a Train of Alternating Ones and Zeroes and Vice Versa
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3,380,023 April 23, 1968 Electronic Alarm System
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3,467,783 September 16, 1969 Speech Bandwidth Reduction by Sampling 1/N Cycles, Storing the Samples, and Reading the Samples Out at 1/N the Sampling Rate
3,471,646 October 7, 1969 Time Division Multiplex System with Prearranged Carrier Frequency Shifts
3,506,966 April 14, 1970 Pulse-Coded Wide Band Radio Communication System
3,532,988 October 6, 1970 Digital Troposcatter Multiplex Communication System Optimum Frequency
3,646,441 February 29, 1972 Digital Radio Communication Systems Using Repeaters Operating at Same Frequency