Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4375922 | Character printing system in electronic data processing apparatus such as electronic calculators A character printing system in an electronic data processing apparatus is provided that is adapted for printing language characters in response to numerical value coded data entered through numeral keys of a keyboard, each character being represented by a... | 03/08/1983 |
| 3978967 | Typewriter tabulator The tabulator blade rack consists of a pivotally and axially movable rod. Depressing the desired decimal tabulation key frees the carriage from the escapement for movement in the typing direction, raises the corresponding tabulator stop, and rotates the t... | 09/07/1976 |
