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 |
| 4050255 | Methods of shifting heavy and/or loaded structures Apparatus for shifting heavy supporting structures relative to stationary load carrying structures comprises a plurality of parallel jack rods secured to the load carrying structure. A plurality of climbing jacks adapted to operatively engage the jack rod... | 09/27/1977 |
| 3979787 | Method of supporting bridge structures and like heavy-weight rigid structures upon displacement thereof For supporting bridge structures and like heavy-weight rigid structures upon displacement thereof, at more points than those giving statically determined bearing forces, the rigid structure is placed on a plurality of hydraulic jacks distributed beneath i... | 09/14/1976 |
| 3945169 | Framework structures A framework structure comprises longitudinal load-bearing elements and bracing elements interconnecting the load-bearing elements and intended to rigidify the structure and take up transverse forces. To this end the fastening of the bracing elements to th... | 03/23/1976 |
| 3940109 | Lifting device for raising, lowering and suspending heavy loads A lifting device for raising, lowering and suspending heavy loads comprises a climbing jack with alternating gripping means and a lifting element. For allowing repeated cooperation with the gripping means the lifting element consists of a plurality of out... | 02/24/1976 |
