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 |
| 6084708 | Double-refracting planar plate arrangement and deep ultraviolet λ/4-plate The invention is directed to a double refracting planar plate arrangement and a λ/4 plate suitable for deep ultraviolet light. The λ/4 plate or the like is configured as a planar plate with stress-induced birefringence. The planar plate 1 is made of hig... | 07/04/2000 |
| 5447131 | Ignition circuit for an internal combustion engine The invention is directed to an ignition circuit for an internal combustion engine in a portable handheld work apparatus wherein a work tool is driven via a clutch. The ignition circuit includes an ignition time point control which connects a spark plug v... | 09/05/1995 |
| 5072804 | Power-assisted steering system A power-assisted steering system for a vehicle such as an automobile or truck and having an electro-mechanical servo drive. The servo drive directs the wheels to be steered which are journalled on a wheel carrier assembly and coacts with a steering wheel ... | 12/17/1991 |
| 4872755 | Interferometer for measuring optical phase differences For generating several interferograms which differ from each other in the relative phase position between the interfering partial beams, a light source is utilized having a coherence length less than the optical path difference between the two component b... | 10/10/1989 |
| 4359615 | Switch and means to prevent unauthorized operation thereof A switch actuator in the form of a bifurcated elongated member has a pair of legs pivoted relative to each other. In the "off" position of the switch, the legs may be pivoted relative to each other, and the actuator may be withdrawn from the switch. This ... | 11/16/1982 |
