Quotables
"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7188841 | Secondary piston seal A secondary seal is provided for an internal combustion engine having a piston, cylinder bore, ring seal, secondary seal, and leak path. Forces are applied from the combustion side of the piston through a cylinder gap and a leak path to the secondary seal. The secon... | 03/13/2007 |
| 6361050 | Oppositely angled piston ring grooves A piston is disclosed having both downwardly and upwardly inclined piston ring grooves, the grooves being angled less than approximately ten degrees with respect to a horizontally extending axis. In a preferred embodiment, the grooves are less than approx... | 03/26/2002 |
| 4178899 | Low-friction piston A piston comprising hydrodynamic skirts and crowns, pressure-actuated sealing rings of fixed excursion or balanced by hydrodynamic reactions, or no rings at all, stringent temperature control, ample oil on the cylinder wall even near top-dead-center, char... | 12/18/1979 |
