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 |
| 4074275 | Strip chart recorder A portable strip chart recorder includes a programmable electronic drive circuit to drive an electric motor and a means for identifying the strip chart as having been recorded on a specific recorder, said strip chart incorporating graphic means of identif... | 02/14/1978 |
| 3990083 | Device for recording patient care A device is provided for recording written information dealing with the care of a patient. Each additional entry advances the previous entry and records it as a permanent record on the same tape roll. Each earlier entry is thereby hidden from view, thus p... | 11/02/1976 |
