| 2971058 | Method of and apparatus for speech analysis and printer control mechanisms | 1961-02-07 | ||
| 2938079 | Spectrum segmentation system for the automatic extraction of formant frequencies from human speech | 1960-05-24 | ||
| 2921133 | Phonetic typewriter of speech | 1960-01-12 | ||
| 2824906 | Transmission and reconstruction of artificial speech | 1958-02-25 | ||
| 2646465 | N/A | 1953-07-21 |