3,420,955

"Automatic Peak Selector," A. Michael Noll (filed November 19, 1965; issued January 7, 1969).

3,493,684

"Vocoder Employing Composite Spectrum-Channel and Pitch Analyzer," James M. Kelley, A. Michael Noll, and Manfred R. Schroeder (filed June 15, 1966; issued February 3, 1970).

3,555,191

"Pitch Detector," A. Michael Noll (filed July 15, 1968; issued January 12, 1971).

3,566,035

"Real Time Cepstrum Analyzer," A. Michael Noll and Manfred R. Schroeder (filed July 19, 1969; issued February 23, 1971).

3,919,691

"Tactile Man-Machine Communications System," A. Michael Noll (filed May 26, 1971; issued November 1, 1975).

unissued

"Raster Scan Computer Graphics System," A. Michael Noll (filed February 5, 1970; abandoned at Supreme Court in 1977).

4,081,620

"Sidetone Control Circuit for a Telephone Set," D.J. Goodman, J.D. Johnston, A. Michael Noll (filed May 20, 1977; issued March 28, 1978).