Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7245050 | Internal combustion engine A journal of a crankshaft is rotatably supported by a journal-supporting portion of a cylinder block and a bearing cap. An arcuate oil guide groove is defined in a side face of the bearing cap, and coils which are portions of a stator of a generator or motor are fit... | 07/17/2007 |
| 7124716 | Internal combustion engine using opposed pistons An internal combustion engine having a cylindrical outer housing with inner cylindrical cylinders defining power cylinders circumferentially spaced in the engine. Each of the cylinder(s) has opposed intake and exhaust pistons. The intake and exhaust pistons use air ... | 10/24/2006 |
| 7011469 | Piston joint A joint for positioning between first and second elements includes an outer member and an inner member. The first and second elements are arranged for linear motion along a common axis. The outer member is configured for movement relative to the first and second ele... | 03/14/2006 |
| 6935285 | Two-cycle combustion engine having two-staged piston A two-cycle combustion engine having a two-staged piston, is simple in structure and inexpensive and addresses a undesirable blow-off phenomenon of the air-fuel mixture. The two-cycle combustion engine includes a cylinder block having a two-staged cylinder bore with... | 08/30/2005 |
| 6925973 | Piston engine assembly A variable compression piston assembly includes a plurality of pistons, a transition arm coupled to each of the pistons, and a rotating member mounted for pivoting movement to slide along an axis of the drive member. Movement of the rotating member relative to the d... | 08/09/2005 |
| 6915765 | Piston engine assembly A variable compression piston assembly includes a plurality of pistons, a transition arm coupled to each of the pistons, and a rotating member mounted for pivoting movement to slide along an axis of the drive member. Movement of the rotating member relative to the d... | 07/12/2005 |
| 6913447 | Metering pump with varying piston cylinders, and with independently adjustable piston strokes A metering pump includes an actuating mechanism, and a plurality of piston cylinders coupled to the actuating mechanism. A first of the cylinders has a working volume that differs from a second of the cylinders. The actuating member is centrally located and the cyli... | 07/05/2005 |
| 5603291 | Internal combustion engine with valve built into piston head An internal combustion engine with an exhaust valve formed in the upper surface of the piston and driven by a valve stem connected to the engine crankshaft by an operating arm mounted parallel to the connecting rod and axially movable with respect thereto... | 02/18/1997 |
| 5551383 | Internal combustion engine utilizing pistons An internal combustion engine having a cylindrical outer case(s) defining a base compression cylinder(s) with an inner cylindrical cylinder(s) defining power cylinder(s) circumferentially spaced in the engine and each housing opposing intake and exhaust p... | 09/03/1996 |
| 5490482 | Two cycle engine with piston mounted poppet valve operating mechanism A two cycle piston engine is described in which one or more intake poppet valves are carried in the top of the piston which driven onto a respective mating valve seat in the cylinder head by piston movement towards top dead center, a spring allowing retra... | 02/13/1996 |
| 5261358 | Internal combustion engine An internal combustion engine comprises a cylinder of stepped configuration having a working portion and a pumping portion and a piston of stepped configuration having a working portion and a pumping portion, the working and pumping portions respectively ... | 11/16/1993 |
| 4958601 | Valved piston with rocker arm journaled to piston The invention comprises an internal combustion engine having at least one cylinder, a movable piston in the cylinder, a valve in the head of the piston, a push pin engaging the valve, a rocker arm pivoted at one end to the piston and engaging the push pin... | 09/25/1990 |
| 4791892 | Two-stroke engine A two stroke engine including a single piston housing, a transfer port, an inlet port in the housing, an exhaust port in the housing, a piston located in the housing, a connecting rod integral with or otherwise rigidly secured to the piston, a crankcase l... | 12/20/1988 |
| 4788944 | Internal combustion engine An internal combustion engine includes a housing having a first cylinder chamber and a second cylinder chamber, wherein the cylinder chambers are perpendicular to each other. Each cylinder chamber includes a reciprocating piston assembly having a compress... | 12/06/1988 |
| 4672989 | Flow conditioned nutation valving apparatus and method of operation Structure and method are disclosed for providing timed valving in which a nutating plate having an opening defined therethrough moves relative to at least one other nominally static plate having a complementary opening defined therethrough, the nutating p... | 06/16/1987 |
| 4597403 | Nutation valving apparatus and method of operation Structure and method for providing timed valving in which a nutating plate having an opening defined therethrough moves relative to at least one other nominally static plate having a complementary opening defined therethrough, the nutating plate at one po... | 07/01/1986 |
| 4455974 | Gas bearing piston assembly A gas bearing supported piston assembly (2) for an internal combustion engine including a piston body (14, 14') and a segmented piston ring (3) arranged to expand to compensate for wear. A piston supporting gas layer (27) is formed between the cylinder wa... | 06/26/1984 |
| 4377991 | Internal combustion apparatus An internal combustion apparatus is disclosed having a linear output. A metered quantity of gas fuel is transferred between a cylinder head and the disc of a plunger reciprocable in a principal chamber between top and bottom end of stroke positions. In th... | 03/29/1983 |
| 4325331 | Dual-expansion internal combustion cycle and engine A novel internal combustion cycle and internal combustion engine operating thereon. Expansion of the hot combustion gases is controllably achieved in a primary combustion/expansion chamber and a secondary expansion chamber in a manner to reduce engine exh... | 04/20/1982 |
| 4294201 | Internal combustion engines A two-stoke cycle combustion-engine with crank-chamber compression is described, free of charging transfer passages external to the cylinder, with pumping-displacement exceeding working-displacement for responsive intake and thorough scavenging of spent-g... | 10/13/1981 |
| 4261303 | An internal combustion engine Improvements in an internal combustion engine comprising an elongated stationary piston having an elongated double ended movable piston coaxially mounted thereon for reciprocation. Two stationary combustion cylinders reciprocably receive the opposite ends... | 04/14/1981 |
| 4248184 | Two-cycle diesel internal combustion engine An improved two-cycle Diesel internal combustion engine is provided, whereby the intake and exhaust port passages are modified to provide greater circulation of the combustible fluids and air during the intake and exhaust cycles of the Diesel engine, resp... | 02/03/1981 |
| 4218994 | Fluid intake and exhaust assemblies for positive displacement apparatus Disclosed are intake and exhaust assemblies for forced air intake, reciprocating piston, internal combustion engine. Alternate embodiments of the air intake valve assembly include a hollow tube defining the intake port with means operatively coupling the ... | 08/26/1980 |
| 4206727 | Two-stroke-cycle engine having an auxiliary piston and valve arrangement, and its associated drive mechanism The invention provides a two-stroke-cycle engine which has a main piston, and an auxiliary piston and transfer valve arrangement. and its associated drive mechanism. The engine has also at least two intake valves arranged in the cylinder head. The auxilia... | 06/10/1980 |
| 4187808 | Engine having a variable compression ratio The engine comprises, for each of its cylinders, an auxiliary piston provided with a piston rod. The piston is movable in a cavity which is formed in the cylinder head and opens into the combustion chamber. The cavity defines with the auxiliary piston an ... | 02/12/1980 |
| 4154207 | Piston and ring for reducing HC emissions An internal combustion engine is provided with pistons having openings connecting the space behind one of the piston rings with the crankcase during certain portions of the operating cycle of the engine. This is accomplished by the use of a differential p... | 05/15/1979 |
| 4037570 | Stratified charge internal combustion engine A four stroke cycle internal combustion engine is disclosed with means to provide auxillary pumping of air directly into the cylinder. The piston head is provided with a sliding valve which is self-acting for injecting air into the cylinder during the int... | 07/26/1977 |
| 4027632 | Air injection engine The improvement in a combustion engine of the conventional type includes air inlet means disposed in the vicinity of an end of the cylinder facing away from the spark plug for receiving air into the cylinder, and a first plate attached to the cylinder in ... | 06/07/1977 |
