| Y/M/D | Description | Place |
|---|---|---|
| 1845/11/18 | Patent Office grants Charles Thurber US 4,271 for his 'Mechanical Chirographer', a geared stylus machine enabling blind writers to form script. Ingenious but impractical, the device failed to find a market. | |
| 1857/06/23 | Mr Thurber of Worcester receives US Patent 17,647 for a Calligraph that allows a person "to form large letters, therein being adapted to a large class who from debility or other cause can not command the motions of the fingers or carry the hand steady..." | |
| 1860/11/27 | Charles Thurber receives US Patent No 30777 for the 'Caligraph', a device that creates cursive writing for people have difficulty with their hands or eyes. He advertised it as Kaligraph. The writing machine can be examined at 366 Broadway (lost), NYC. |
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