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"The abolishment of pain in surgery is a chimera. It is absurd to go on seeking it...knife and pain are two words in surgery that must forever be associated in the consciousness of the patient."
Dr. Alfred Velpeau, French surgeon ; 1839
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| Number | Title | Issue Date |
| 7669560 | Gas exchange control mechanism for an opposed-piston engine A gas exchange control mechanism for an opposed-piston engine which opens and closes inlet and outlet slots provided in the cylinder irrespective of the position of the pistons. The opposed pistons are guided completely or partially during stroke in sliding sleeves ... | 03/02/2010 |
| 5456219 | Dual compression and dual expansion internal combustion engine and method therefor An apparatus and method is provided for a dual compression and dual expansion internal combustion engine (8) that is compact, efficient, and has low combustion noise and emissions. The subject engine (8) includes a low pressure piston assembly (56) recipr... | 10/10/1995 |
| 4977864 | Diesel engine An engine is disclosed that is applicable for automotive and truck use but is also adaptive for other power producing uses. Two reciprocating cylinders are housed within an outer cylinder. A piston is housed within each of the two reciprocating cylinders.... | 12/18/1990 |
| 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 |
| 4434752 | Internal combustion engine An engine is shown as having a ring-like cylinder with a ring type piston reciprocatingly received therein, connecting rods operatively interconnect the ring piston to a related crankshaft; the combustion chamber means is formed generally by two chamber v... | 03/06/1984 |
| 4178885 | Rotary piston/cylinder engines A rotary piston/cylinder engine comprises a rotor assembly which is mounted to rotate about an axis of rotation and comprises a double-headed piston member and a double-headed cylinder member defining two cylinders in which two pistons of the piston membe... | 12/18/1979 |
| 4103651 | Internal combustion-gas turbine engine An engine of the air-cooled, super-charged type which includes a stationary piston, a cylinder movable relative to the piston and operable in a first position to provide a compression chamber between adjoining ends of the cylinder and piston. In a second ... | 08/01/1978 |
