William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 6324510 | Method and apparatus of hierarchically organizing an acoustic model for speech recognition and adaptation of the model to unseen domains A method of organizing an acoustic model for speech recognition is comprised of the steps of calculating a measure of acoustic dissimilarity of subphonetic units. A clustering technique is recursively applied to the subphonetic units based on the calculat... | 11/27/2001 |
| 5727120 | Apparatus for electronically generating a spoken message An improved apparatus for generating a spoken message is of the type formed by (i) first recording speech and (ii) then utilizing the recording so as to obtain at least one carrier, each carrier having at least one fixed part and at least one open slot, a... | 03/10/1998 |
| 5592585 | Method for electronically generating a spoken message An improved method for generating a spoken message is of the type formed by (i) first recording speech and (ii) then utilizing the recording so as to obtain at least one carrier, each carrier having at least one fixed part and at least one open slot, and ... | 01/07/1997 |