Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7100549 | Mechanism including a piston-and-cylinder assembly A mechanism comprising a piston-and-cylinder assembly including a piston housed in a cylinder is provided. The mechanism includes a pin member passing through the piston and a guide member having a guide recess accommodating an end of the pin member, the guide reces... | 09/05/2006 |
| 6343575 | Rotating/reciprocating cylinder positive displacement device This positive displacement device features relative rotation and translation of a piston and a cylinder where the rotation accomplishes a rotary valve function and the translation accomplishes a change in chamber volume function. The preferred embodiment ... | 02/05/2002 |
| 4586881 | Machine having integral piston and cylinder wall sections A compact lightweight engine or pump is constructed having a H-shaped piston, usually double acting. Each end of the piston has extending surfaces which form two moving sidewalls which act with two case sidewalls and a block-shaped head protrusion to defi... | 05/06/1986 |
| 4182283 | Combustion chamber and piston therefor An improved combustion chamber and piston therefor, for an internal combustion engine of the type having a cylinder block and a cylinder head positioned thereabove and having pistons slideably mounted in suitable hollow cylinders in the cylinder block. Th... | 01/08/1980 |
| 3945358 | Rotary internal combustion engine with cam transmission An internal combustion engine comprising a substantially cylindrical casing, a multilobed rotor mounted to rotatably move within said casing, a plurality of substantially cross-sectionally U-shaped combustion chambers slidably mounted in slots or grooves ... | 03/23/1976 |
