Did You Know...
...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 |
| 5168146 | Bi-directional snap-action register display mechanism A bi-directional snap-action register mechanism for an odometer-type mechanical register display. The mechanism includes at least one register display wheel and a bi-directional cam mounted coaxially along a common shaft with the register display wheel. T... | 12/01/1992 |
| 4554443 | Tape cassettes Tape cassettes, particularly video tape cassettes, are provided with means internally to count the number of times the cassette is subjected to a sequence of user operations. This enables a hirer of such cassettes to see how many times the cassette has be... | 11/19/1985 |
| 4493972 | Electrically heated apparatus employing a PTC heater for liquifying a rod of binding material An apparatus for liquifying a rod of binding by application of heat includes a die-cast aluminum heating member having an elongated conical first channel decreasing in diameter from an inlet adapted to receive a rod of liquifiable bonding material through... | 01/15/1985 |
