Hartwell; Walter T.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hartwell; Walter T..The latest application filed is for "digital speech coder with different excitation types".
- Hartwell; Walter T. - St. Charles IL
| Patent | Date |
|---|---|
| Digital speech coder with different excitation types Grant 4,912,764 - Hartwell , et al. March 27, 1 | 1990-03-27 |
| Digital speech vocoder Grant 4,797,926 - Bronson , et al. January 10, 1 | 1989-01-10 |
| Digital speech sinusoidal vocoder with transmission of only subset of harmonics Grant 4,771,465 - Bronson , et al. September 13, 1 | 1988-09-13 |
| Non-invasive blood flow measurements utilizing autoregressive analysis with averaged reflection coefficients Grant 4,719,923 - Hartwell , et al. January 19, 1 | 1988-01-19 |
| Data storage and retrieval structure for a message storage system Grant 4,221,933 - Cornell , et al. September 9, 1 | 1980-09-09 |
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