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 |
| 6401686 | Apparatus using oscillating rotating pistons A motor, expander, compressor, or hydraulic device is formed with an oscillating rotating piston comprising a cylinder having an axis of rotation and end surfaces and defining an oscillating compression volume and an expansion volume. An axial sealing mem... | 06/11/2002 |
| 4819594 | Reversible rotary internal combustion engine A reversible rotary internal combustion engine comprising a stator which defines a cylindrical chamber (43), a drive shaft (1) extending coaxially through the chamber, a rotor (2) comprising a cylindrical hub mounted coaxially on the drive shaft and a rot... | 04/11/1989 |
| 4086880 | Rotary prime mover and compressor and methods of operation thereof A readily reversible, rotary type internal combustion engine which is selectively operable as a compressor and capable of several basic modes of operation, wherein an expansible combustion chamber or volume cyclically initiated from zero volume is chargea... | 05/02/1978 |
