Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 5320162 | Single pole double throw thermostat for narrow range temperature regulation A thermostat is disclosed having a bimetallic strip actuating a single pole, double throw switch, one throw to sense temperatures below the lower limit of a set point range and the other throw to sense temperatures above the upper limit of the set point r... | 06/14/1994 |
| 5274525 | Device for thermal protection within a limited range of temperatures, especially for an apparatus for recording battery-backed data and in particular a franking machine A data-recording machine is protected against temperature overshoots by a device (12) for protecting electrical lines comprising two blister-type thermosensitive elements (10C, 10F) which control series-connected electric contacts (7C, 7F) so as to close ... | 12/28/1993 |
| 4633211 | Electrical switch construction and method of making the same A switch construction having a support carrying a pair of spaced apart first and second fixed contacts and a movable switch blade unit carrying a contact unit for being disposed in contact with the first fixed contact and out of contact with the second fi... | 12/30/1986 |
| 4414524 | Thermally responsive switch A thermally responsive switch is particularly adapted to perform a plurality of electrical control functions on an automotive engine in response to changes in engine temperature. The switch is characterized by a structure permitting the switch operating t... | 11/08/1983 |
| 4295114 | Thermo-switch A thermostatic switch (10) employs a switch blade (22) having spaced thereon a set of service contacts (16, 20). One end of the blade is supported by a heat collapsible support (46) and a second set of contacts (26, 24), the contact sets being electrically in ... | 10/13/1981 |
| 4112406 | Duplex thermostat A thermostat is provided for controlling a heating apparatus having two individually actuatable heating elements in order to more accurately control the heat output of the apparatus. The thermostat is designed such that at environment of temperatures belo... | 09/05/1978 |
