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 |
| 5534959 | Film plane rotation in rigid cameras for depth of field and perspective control A rigid camera with a film holder independently rotatable about a horizontal axis and a vertical axis. The film holder rotates synchronously with the focusing plate of the viewfinder. The focusing plate rotates independently about a first horizontal axis ... | 07/09/1996 |
| 4185200 | Apparatus for loading and unloading cassettes for X-ray films Apparatus for admitting sheets of unexposed X-ray film into and for removing sheets of exposed X-ray film from cassettes of the type having two pivotally connected sections which are separably locked to each other has a housing with a wall which is pivota... | 01/22/1980 |
