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 |
| 5159149 | Electronic device An electronic detonator system 10 comprises a remote RF transmitter 11 and a transportable housing 12 comprising means 13 for charging energy storage means in the detonator 15 and means 14 for programming delay time means in the detonator. The programming... | 10/27/1992 |
| 5038682 | Electronic device A remote controllable electronic detonator and a method of detonating an explosive charge are disclosed and claimed. The detonator comprises an antenna 16, a RF receiver 15, an energy storage capacitor 17, a switch 18, a delay time circuit 21 and a fuse 1... | 08/13/1991 |
| 4646092 | Method of and apparatus for continuous wave electromagnetic distance measurement of positioning In a continuous wave electromagnetic positioning or distance measuring system of the Wadley type (see U.S. Pat. No. 2,907,999) a number of secondary phase measurements are obtained from a number of successively produced primary phase measurements in such ... | 02/24/1987 |
| 4631497 | Injection locked RF oscillator with control hoop An injection locked RF oscillator comprises a variable frequency RF source 12 having a Gunn diode 20 and a varactor 22, and a frequency stable reference oscillator 14 whose output fi is injected into the source to cause injection locking of the... | 12/23/1986 |
| 4577150 | Phase measuring method and apparatus A continuous wave electromagnetic distance measuring system comprises a master station 12.3 and a remote station 12.4. A pattern signal having an accurately known pattern frequency is propagated electromagnetically from the master station to the remote st... | 03/18/1986 |
