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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 3983803 | Automatic print gap adjustment arrangement A mechanism is disclosed for automatically positioning the print mechanism with respect to the forms and ribbon in a printer assembly. The automatic adjustment takes place for varying thicknesses of the forms, which is a function of the number of copies b... | 10/05/1976 |
| 3974905 | Key arm mechanism A key arm mechanism for keys of a typewriter or data entry device in which a uniform spring rate is achieved by varying the cross-sectional area of the key arms as a direct relation to the distance of the key support posts from a cantilever point. The ent... | 08/17/1976 |
| 3938642 | Magnetic key touch control The "touch" or "feel" of a key in a keyboard is controlled by a system of permanent magnets. A first magnet is attached to one end of a key lever and the key lever is pivoted intermediate its ends. A bias spring is provided to normally bias the key lever ... | 02/17/1976 |
