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 |
| 7146921 | Rotationally retractable propeller A retractable thruster for a surface or submersible vessel, having thruster a propulsion assembly with a rigid structure secured to a cylindrical turbine. The rigid structure contains a motor suitable for rotating at lease one propeller inside the turbine via at lea... | 12/12/2006 |
