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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7329959 | Micro power generator and apparatus for producing reciprocating movement There is provided a micro power generator enhanced in efficiency and power generation output, and having an increased temperature range for operation. The micro power generator comprises: a high-temperature heat source; a low-temperature heat source; an enclosed bod... | 02/12/2008 |
| 7174732 | Cooling control device for condenser Cooling control device for a condenser is provided which includes the condenser, a cooling device for cooling the condenser, and a control device for controlling the cooling device. The cooling device includes a first cooling fan for cooling a gaseous-phase portion ... | 02/13/2007 |
| 7080512 | Heat regenerative engine A heat regenerative engine uses water as both the working fluid and the lubricant. In operation, water is pumped from a collection pan and through a coil around a cylinder exhaust port, causing the water to be preheated by steam exhausted from the cylinder. The preh... | 07/25/2006 |
| 6272855 | Two cycle heat engine A heat engine having two stages, a first low temperature chamber and a second high temperature chamber. A low boiling point liquid or solution is heated in a first low temperature chamber to slightly above the boiling point. A second high temperature cham... | 08/14/2001 |
| 6250078 | Engine cycle and fuels for same An engine cycle that is carried out in a reciprocating piston/cylinder engine consists of a working stroke in which exothermic decomposition of at least one liquid compound is caused to occur without combustion so as to produce a gaseous product of the de... | 06/26/2001 |
| 6247309 | Cylinder piston unit, especially for steam engines The invention relates to a cylinder piston unit, especially for steam engines with expansion by heat influx, which is constructed as follows: a piston guided in the cylinder element has a displacer, a heating device is mounted on the cylinder element for ... | 06/19/2001 |
| 6119457 | Heat exchanger apparatus using porous material, and ceramic engine provided with supercharger driven by thermal energy recorded from exhaust gas by the same apparatus A heat exchange apparatus has heat exchangers comprising porous material of improved heat exchange efficiency provided in an exhaust passage, and a ceramic engine provided with a supercharger comparing a steam turbine driven by the steam generated in the ... | 09/19/2000 |
| 5035115 | Energy conserving engine An energy conserving engine particularly for heavy power requirements in freight movers and power plants, consists of an Otto cycle Diesel engine modified to receive superheated water injection for steam operation. The waste energy resulting from heat due... | 07/30/1991 |
| 4783963 | Internal combustion steam engine A high temperature, high pressure, four-cycle piston engine having two companion cylinders or multiple pairs of companion cylinders connected by a transfer valve or valves and working together to complete the four-cycle operation. The internal combustion ... | 11/15/1988 |
| 4599859 | Combined steam generator and engine A combined steam generator and engine including a means for spraying a finely atomized vaporizable liquid at all areas of an extensive heat exchanging surface. The opposite surface of walls providing the extensive heat exchanging surface is in direct cont... | 07/15/1986 |
| 4437308 | Rotary heat engine A rotary external combustion engine wherein energy is supplied to a working space of the engine by direct injection into the stator of liquid water at a high temperature and pressure. The water acts as a heat-transfer medium. Some of the liquid water spon... | 03/20/1984 |
| 4432203 | Rotary external combustion engine A rotary external combustion engine wherein energy is transferred to air acting as a working gas by injection into the air of liquid water at a high temperature and pressure. The liquid water is injected either directly into the working space in the stato... | 02/21/1984 |
| 4426847 | Reciprocating heat engine A reciprocating external combustion engine wherein energy is supplied to a working end space of the engine by direct injection into the cylinder of liquid water at a high temperature and pressure. The water acts as a heat-transfer medium. Some of the liqu... | 01/24/1984 |
| 4416113 | Internal expansion engine This disclosure relates to internal expansion engines of the type where a non-combusting operating fluid is vaporized within a cylinder or cylinders so that the vapor upon expansion performs mechanical work. The internal expansion engine utilizes a non-co... | 11/22/1983 |
| 4393653 | Reciprocating external combustion engine A reciprocating external combustion engine wherein energy is transferred to air acting as a working gas by injection into the air of liquid water at a high temperature and pressure. The liquid water is injected either directly into the cylinder or into a ... | 07/19/1983 |
| 4220005 | Combination vaporized driving fluid generator and engine unit A vaporized driving fluid generator and engine unit are associated in open communication with each other with driving fluid being injected, in synchronized relation to the cyclic operation of the engine, into an externally heated casing which contains hea... | 09/02/1980 |
| 4195481 | Power plant A prime source of mechanical power comprising an expansion chamber, an inlet into which expansible fluid is injected, and an outlet through which said fluid is exhausted after expansion in said chamber. Expansion of the fluid is achieved by application of... | 04/01/1980 |
| 4144716 | Solar powered engine and tracking system A solar powered engine and tracking system comprises a piston working within a cylinder for turning a drive shaft for driving an electrical generator or performing other useful work, a solar concentrator comprising a plurality of mirrors, each reflecting ... | 03/20/1979 |
| 4077214 | Condensing vapor heat engine with constant volume superheating and evaporating A heat-power engine and system using a condensable vapor as the working fluid has a cylinder with a piston operating therein characterized in that the heat input communicates with the clearance volume of the cylinder, and all of the working fluid, mechani... | 03/07/1978 |
| 4055951 | Condensing vapor heat engine with two-phase compression and constant volume superheating A heat-power engine and system using a condensable vapor as the working fluid has a cylinder with a piston operating therein characterized in that the heat input communicates with the swept volume of the engine in a zone comprising the clearance volume of... | 11/01/1977 |
