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 |
| 4058094 | Speed control device A regulating servo loop for controlling the speed of an internal combustion engine to a preselected rate, including a tachometer connected for rotation of the output of the engine, a mechanical actuator controlling the carburetor opening of the engine and... | 11/15/1977 |
| 4034725 | Electric governor An electric governor for an internal combustion engine comprises an engine speed sensor, a phase shifter, a twin-T type filter and a multiplier for multiplying outputs of the phase shifter and the twin-T type filter. The twin-T type filter is arranged to ... | 07/12/1977 |
| 3970058 | Revolution control circuit for internal combustion engine A revolution control circuit for an internal combustion engine comprising a speed voltage generator for generating a speed voltage in accordance with the number of revolutions of the engine, an oscillator circuit which starts to oscillate when the speed v... | 07/20/1976 |
