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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 |
| 7621255 | Toroidal engine method and apparatus A rotary motion device having piston valves that define an open region that are adapted to engage a power tooth of the power ring as the power ring rotates around the piston valves and the piston valves rotate about their own separate axis that is fixed with respect... | 11/24/2009 |
| 7398757 | Toroidal engine method and apparatus A rotary motion device having piston valves that define an open region that are adapted to engage a power tooth of the power ring as the power ring rotates around the piston valves and the piston valves rotate about their own separate axis that is fixed with respect... | 07/15/2008 |
| 7341041 | Toroidal engine with variable displacement volume A novel rotary engine of the kind having a toroidal cylinder and a set of pistons on a rotating circular piston assembly provides instantaneous adjustment of the displacement volume of the engine by varying the intake and expansion stroke length on the circular path... | 03/11/2008 |
| 7325529 | Method and apparatus for controlling combustion quality of a gaseous-fuelled internal combustion engine A method and apparatus for controlling to a target heat release rate (HRR) uses an HRR control lever, namely, pilot fuel timing and/or pilot fuel quantity, used in a gaseous-fuelled compression ignition internal combustion engine. The mechanism to control HRR to a t... | 02/05/2008 |
| 7322193 | Exhaust gas recirculation system An exhaust gas recirculation (EGR) system is provided for an internal combustion engine having a combustion air intake circuit, an exhaust manifold, and an exhaust circuit for communicating engine exhaust to the environment. The EGR system includes an air-to-gas EGR... | 01/29/2008 |
| 7311077 | Rotary positive displacement machine with orbiting piston A casing has a circular cylindrical internal surface delimiting an operating chamber. An orbiting piston is mounted so as to orbit about a chamber axis which is the axis of the internal surface. The orbiting piston has a circular cylindrical external surface, a gene... | 12/25/2007 |
| 7305937 | Rotary toroidal machine with piston connecting mechanism A rotary machine includes a housing divided into a first stationary portion and a second rotational portion. The second rotational portion is supported for rotation with respect to the stationary portion about an axis of the housing. The first and second portions of... | 12/11/2007 |
| 7270108 | Opposed piston, homogeneous charge pilot ignition engine An engine of the opposed piston, two-stroke, compression ignition type includes provision for injection of a main charge of liquid fuel into the bore of a cylinder between opposed pistons early in a compression stroke to permit the fuel to evaporate and mix with air... | 09/18/2007 |
| 7171941 | Positive displacement rotary device and method of use A positive displacement rotary device and method of use are provided. The rotary device includes coupled chamber halves with a drive disc having at least one drive plate rotatably engaged with the drive disc. The drive disc is mounted on a drive shaft and positioned... | 02/06/2007 |
| 7168420 | System and method for engine operation with spark assisted compression ignition A method of operating an internal combustion engine having a combustion chamber with a piston, comprising: inducting at least air and fuel vapors from a fuel vapor system; and adjusting an operating condition of the engine so that a mixture of air and fuel in the co... | 01/30/2007 |
| 7128045 | Combustion engine The invention relates to a combustion engine (1) having a housing (2) with a chamber (3). A rotor (4) is arranged herein which is provided with a number of vanes (5A, 5B, 6A, 6B) which divide the chamber into a... | 10/31/2006 |
| 7059294 | Orbital engine An engine is disclosed including at least one piston which is positioned within a toroidal piston chamber. A method of operating an engine is disclosed wherein a piston is advanced in a toroidal piston chamber past a first valve and the first valve is closed to form... | 06/13/2006 |
| 7036482 | Multi-fuel compression ignition engine A liquid primary fuel is ignited by HCCI with the assistance of the early injection of a liquid pilot fuel. Pilot fuel injection and/or ignition are preferably controlled so as to permit the injected pilot fuel to become thoroughly distributed through and mixed with... | 05/02/2006 |
| 6799549 | Combustion and exhaust heads for fluid turbine engines An internal combustion rotary engine which includes a housing encased rotor having: cam actuated inwardly and outwardly extending vanes, a combustion chamber communicating with a fluid inlet port to the vanes within the housing, and an exhaust chamber ... | 10/05/2004 |
| 6550442 | Rotary machine used as a four-cycle rotary combustion engine, a compressor, a vacuum pump, a steam engine and a high pressure water motor A new mechanical movement consisting of a main stationary cylinder into which there is a rotary cylinder configured to rotate about a fixed rotor axis, and through which a certain number of vanes are anchored at the center of the main cylinder. The vanes ... | 04/22/2003 |
| 6530357 | Rotary internal combustion engine The present invention pertains to rotary internal combustion engines and essentially relates to an engine including a body that comprises an inner cylindrical cavity as well as side covers. The cavity comprises a rotor-piston which is concentrically mount... | 03/11/2003 |
| 6250277 | Toroidal internal combustion engine A rotary engine with one or more toroidal chambers defined by rotors that rotate within cylindrical housings. Pistons project into the chambers from the rotors. The pistons cooperate with valves to define compression regions and expansion regions in the c... | 06/26/2001 |
| 6247443 | Rotary internal combustion engine and rotary internal combustion engine cycle An internal combustion rotary engine (1) comprises an engine casing (300) in which is rotatably mounted a cylindrical rotor assembly (2) co-axially fixed to a drive shaft (6). The rotor (3) receives a plurality of reciprocating vanes (9, 10, 11) in a stag... | 06/19/2001 |
| 6132197 | Toroidal internal combustion engine A rotary engine with one or more toroidal chambers defined by rotors that rotate within cylindrical housings. Pistons project into the chambers from the rotors. The pistons cooperate with valves to define compression regions and expansion regions in the c... | 10/17/2000 |
| 6065874 | Linear bearing Prior art linear bearings generally have a roller element which, in such a reciprocating motion application, tend to creep or slide along the surfaces upon which they roll. This is due to unequal frictional forces between the rolling surfaces. The linear ... | 05/23/2000 |
| 5517960 | Rotating internal combustion engine A rotating internal combustion engine having a structure including an outer housing and inner rotors arranged as concentric rotating bodies. The rotating internal combustion engine is designed to prevent oil films from rupturing as well as to prolong the ... | 05/21/1996 |
| 5357923 | Rotary piston internal combustion engine A rotary piston internal combustion engine, includes a common housing; a stationary hollow hub; two rotary piston systems in the housing, each system including at least one piston rotor having partial cylindrical areas and front areas, the second rotary p... | 10/25/1994 |
| 4620515 | Rotary fluid-handling mechanism constructed as an internal combustion engine A rotary mechanism for handling fluids constructed as an internal combustion engine (diesel or otherwise), has a rotor internally cylindrically recessed from one end to receive, in close fitting, sealing relationship, a stationary cylindrical support for ... | 11/04/1986 |
| 4414938 | Rotary internal combustion engine A rotary type internal combustion engine including a cylindrical rotor having a diametrical slot parallel with the longitudinal axis of the rotor and a vane movably mounted in the vane groove and constituted by two vane parts opposed to each other at the ... | 11/15/1983 |
| 4401070 | Rotary engine An internal combustion engine has a rotor and a vane extending slidably through the rotor in a transverse direction for rotation therewith. The vane has opposite ends extendable beyond the rotor. A stator has a hollow, cylindrical interior. The rotor is r... | 08/30/1983 |
| 4399654 | Power plant having a free piston combustion member A power plant including a vane type engine having fuel compression means and a gas expansion means. Air or an air-fuel mixture compressed by the vanes in the compression means is fed to a free piston combustion member where burning takes place and gases a... | 08/23/1983 |
| 4316439 | Rotary engine with internal or external pressure cycle Disclosed herein is a rotary engine operable as an internal combustion engine or powered from an external source, the engine comprising essentially three parts: (1) an outer housing or body, (2) a valve shaft extending axially through the body and having ... | 02/23/1982 |
| 4127094 | Engine This invention is an engine for operating on internal combustion, steam or compressed gases or as a pump and has one or more cam faced pistons which move along a cylinder tube and open and close valve valves which separate lengths of the cylinder into cha... | 11/28/1978 |
| 4086881 | Rotary engine The invention pertains to a rotary engine characterized by the fact that it consists of a cylindrical outer shell and of a concentric internal cylindrical body, between which operates a coaxial rotary piston which is also cylindrical, and of a chamber for... | 05/02/1978 |
| 4055156 | Rotary engine An internal combustion engine of the rotary type having an elliptical housing within which charge-carrying pistons move. The engine includes a stationary central portion having an elliptical outer surface about which the pistons move. A pair of gate valve... | 10/25/1977 |
| 4014298 | Concentric rotary engine A concentric rotary engine of the internal combustion type is provided which includes a rotor concentrically disposed within a hollow rotor housing. The rotor, which has a perimetrical cam surface defining lobe portions separated by pocket portions, is in... | 03/29/1977 |
| 4013046 | Rotary engine A rotary engine utilizing hydrocarbon fuel having a circular rotor with one or more spaced pistons which are in sealing relationship with a generally circular torus. One or more compression expansion valves which rotate about an axis tangent to the torus ... | 03/22/1977 |
| 3951110 | Rotary engine arrangement A rotary internal combustion engine wherein the compression and the power functions are produced by a single rotor with the compression function being achieved by means of vanes that move longitudinally of the axis of rotation of the rotor and cooperate w... | 04/20/1976 |
| 3938478 | Rotary internal combustion engine A concentric, valveless internal combustion engine is provided, consisting essentially of a rotary piston which revolves in a casing about a central shaft. The rotary piston contains combustion cavities distributed equidistantly around its perimetral wall... | 02/17/1976 |
