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 |
| 4407596 | Case shift and lock input mechanism including a shift control switch A case shift and lock input mechanism comprising a pair of independently depressable shift keylevers and a depressable shift lock keylever are assembled in a keyboard for actuating a single shift control switch used to condition a printer for printing upp... | 10/04/1983 |
| 4396306 | Line spacing mechanism for typewriters or like machines A line spacing mechanism having a platen, a line spacing ratchet, a line spacing lever mounting a pawl adapted to engage and to drive said ratchet upon pivoting movement of said line space lever, a setting lever for controlling the time of engagement of s... | 08/02/1983 |
| 4373823 | Ribbon guide for an inked ribbon cartridge A cartridge for an inked ribbon for type bar typewriters comprises a container adapted to be mounted on one side of the printing point and a terminal part which guides a length of ribbon to the printing point and reverses the direction thereof for reentry... | 02/15/1983 |
| 4277192 | End of line locking mechanism for power operated typewriter A power operated typewriter having an end of line locking mechanism comprises a clutch interposed between a drive motor and a printing mechanism, a control lever for engaging the printing clutch to print a character by the printing mechanism when a key le... | 07/07/1981 |
| 4201134 | Printing pressure damping mechanism for hand labeler A printing pressure damping mechanism for a hand labeler: A printing platen is pivotally mounted on the frame of the hand labeler. The platen has a printing portion at one side of its center of pivotal motion. A hand lever pivotally connected to the frame... | 05/06/1980 |
| 4195939 | Type bar actuating mechanism for a typewriter A typewriter of the kind having an array of typebars each movable by means of a flexible tension element or string connecting the typebar to the shank of a corresponding key, is provided with improved means connecting each string to the associated key. Th... | 04/01/1980 |
| 4188137 | Low silhouette keyboard A low silhouette keyboard having a plurality of keylevers arranged in rows and in parallel relationship to one another are suspended, guided and biased to restore by opposing flexible support members. The keylevers are "T" shaped which includes a cross ar... | 02/12/1980 |
| 3981385 | Typing machine key action An interposer in a typing machine key action is supported by an arcuate spring and a shelf. When a key lever bears against the arcuate spring to release the interposer from the shelf, the arcuate spring snaps the interposer against a pawl that engages a p... | 09/21/1976 |
| 3976181 | Typing machine repeat key action A gap is provided between two teeth on a power roll in a typing machine repeat key action, and a cam follower surface is provided on a repeat interposer. A repeat typing operation can be initiated only when the cam follower surface engages the gap. When t... | 08/24/1976 |
| 3934696 | Keyboard touch control A keylever touch control mechanism for typewriters includes keylevers mounted on a common pivot which spans the distance between the spaced side frames of the typewriter. The keylevers are supported in their rest position by a plurality of underlying leaf... | 01/27/1976 |
