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 |
| 5564657 | Electronically controlled locomotive throttle controller including remote multiple unit throttle control An electrically controlled railway locomotive throttle controller including a power source connected to a central processing unit disposed on such locomotive. An encoder device is disposed on such locomotive for providing at least one electrical signal to... | 10/15/1996 |
| 5251856 | Model train controller for reversing unit A control circuit which will momentarily apply a pulse of power to the E-Unit solenoid in response to the momentary interruption of power by the transformer or another control signal. The E-Unit rest state is thus with no power applied, eliminating noise ... | 10/12/1993 |
| 5166610 | Dual range speed indicator with acceleration display A solid state speed indicator for railroad locomotives is provided with a plurality of indications in addition to speed. These include an acceleration indicator and an overspeed indicator. In addition, the speed indicator is provided with a dual range spe... | 11/24/1992 |
| 4944474 | Speed indication system A system and method for indicating the speed of a locomotive during low speed continuous loading and or unloading of bulk materials such as coal. The system utilizes treadle switches which are equally spaced along a track, the treadle switches generating ... | 07/31/1990 |
| 4468814 | Radio channel visual identification system A visual identification system for a multi-channel radio having a channel selector switch is provided which produces a flashing light visible in all directions identifying the selected radio channel. The visual identification system comprises a plurality ... | 08/28/1984 |
| 4224874 | Alert system in a mobile track surfacing machine An alert system in a mobile track surfacing machine arranged for intermittent advancement by selected distances from one tamping station to a succeeding tamping station and comprising an operator's station including a control panel for enabling the operat... | 09/30/1980 |
