Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 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 |
| 7261066 | Piston for an internal combustion engine A pivoted piston for an internal combustion engine. The piston has a pivot pin and an arcuate first sealing surface (12) which describes a circumferential path about the pivot pin which forms a removable and replaceable skirt to the piston. The piston also in... | 08/28/2007 |
| 7255065 | Piston for an internal combustion engine A pivoted piston for an internal combustion engine. The piston has a pivot pin and an arcuate first sealing surface (12) which describes a circumferential path about the pivot pin which forms a removable and replaceable skirt to the piston. The piston also in... | 08/14/2007 |
| 7252020 | Vehicle drive-train including a clutchless transmission, and method of operation A vehicle drive-train includes a drive-motor having an output shaft and a transmission having an input shaft, an output shaft, a plurality of discrete forward gear ratios and a corresponding plurality of synchronizers. Each of the synchronizers is configured to mech... | 08/07/2007 |
| 7143723 | Piston for an internal combustion engine A pivoted piston for an internal combustion engine. The piston has a pivot pin and an arcuate first sealing surface (12) which describes a circumferential path about the pivot pin which forms a removable and replaceable skirt to the piston. The piston also in... | 12/05/2006 |
| 6948473 | 4-cycle, rotary, electromagnetic, internal combustion engines Four-cycle rotary engines, with an even number of hinged-hub impeller vanes, utilize dependently rotating, joined, hinged-hub impellers, with interdigitated, alternating hub sections, on a shared, power output shaft, and electromagnetic fields, and timing of impelle... | 09/27/2005 |
| 6938588 | Controllable combustion method and device A method and device for controllably combusting combustible material, including a combustion device comprising an elongate combustion tube having an inlet section including an inlet for combustible material, an ignition section, including an igniter displaced along ... | 09/06/2005 |
| 6880494 | Toroidal internal combustion engine Toroidal internal combustion engine comprising two concentric engine rings. Intake valves are assembled in two faces of one set of pistons and exhaust valves in two faces of the second set of pistons. The intake-valve pistons are fixedly attached to one of the engin... | 04/19/2005 |
| 6691647 | Engine and drive system The engine comprises four open-ended curved cylinders (10) disposed in torroidal arrangement with respect to a central pivot point (11). Two piston arms (12) are pivoted about the point (11) and carry at their ends four pistons (13). Each piston (13) has ... | 02/17/2004 |
| 6386838 | Combustion engine A reciprocating rotating engine having a combustion chamber and a pumping chamber is provided with two sets of free pistons and pumps vanes each set having two pistons and two pump vanes. The two sets of pistons and pump vanes define four separate combust... | 05/14/2002 |
| 6382143 | Balanced modular pendulum mechanism The present invention relates to a balanced pendulum mechanism that is useful in devices such as vacuum pumps, compressors, engines and blowers. The mechanism includes a pair of toroidal shaped cylinders originating from the centerline of a central axis, ... | 05/07/2002 |
| 6270322 | Internal combustion engine driven hydraulic pump A reciprocating rotating engine having a combustion chamber and a pumping chamber is provided with two sets of free pistons and pumps vanes each set having two pistons and two pump vanes. The two sets of pistons and pump vanes define four separate combust... | 08/07/2001 |
| 6021746 | arc-piston engine An engine having an annular cylinder formed about an opening which utilizes an arc-piston reciprocally positioned in the annular cylinder with a partition secured within the annular cylinder separating the annular cylinder into an air intake compression c... | 02/08/2000 |
| 5996538 | Two-cycle internal combustion engine and method of operation Two pairs of double-acting pistons are disposed in a hollow toroidal structure. Each pair of the double-acting pistons is operatively connected together and moves in the same rotational direction. Each of the pistons has two heads which cooperate with a h... | 12/07/1999 |
| 5970924 | Arc-piston engine An engine having an annular cylinder formed about an opening which utilizes an arc-piston reciprocally positioned in the annular cylinder with a partition secured within the annular cylinder separating the annular cylinder into an air intake compression c... | 10/26/1999 |
| 5740765 | Rotary piston internal combustion engine A rotary piston internal combustion engine includes a housing defining a cylinder chamber in the form of a circular ring. An even number of pistons circulate in the piston chamber and are of a circular cross-section adapted to the cylinder chamber. Two pi... | 04/21/1998 |
| 5560324 | Oscillating piston internal combustion engine An internal combustion engine having a plurality of arcuate pistons mounted to ends of pivotally moveable connecting rods. Each piston oscillates within an arcuate cylinder and a combustion chamber is provided at each end of the cylinder. Crankshafts are ... | 10/01/1996 |
| 5467744 | Oscillating piston engine for helicopters The system including an internal combustion engine provides the motive power source to the main and tail rotor systems of a helicopter. The engine has a rotating annular cylinder which is rotated in a predetermined ratio to oscillation of a plurality of p... | 11/21/1995 |
| 5406916 | Double acting, rectangular faced, arc shaped, oscillating piston quadratic internal combustion engine or machine An oscillating piston machine, specifically adapted for use as an Internal Combustion Engine, preferably for two stroke operation, or alternatively, specifically adapted for use as a compressor, or alternatively as a pump, or alternatively as a fluid driv... | 04/18/1995 |
| 5323737 | Electrical charging system for an electric powered vehicle A system including an internal combustion engine provides the motive power source to for charging batteries of an electric motor powered vehicle. The engine has a rotating annular cylinder which is rotated in a predetermined ratio to oscillation of a plur... | 06/28/1994 |
| 5324176 | Oscillating piston engine for pumping system The system including an internal combustion engine provides the motive power source to a pumping system for the transference of fluids, e.g. water. The engine has a rotating annular cylinder which is rotated in a predetermined ratio to oscillation of a pl... | 06/28/1994 |
| 5303546 | Oscillating piston engine for driving a ducted fan An internal combustion engine provides the motive power source to various types of aircraft using a ducted fan. The engine has a rotating annular cylinder which is rotated in a predetermined ratio to oscillation of a plurality of pairs of oscillating pist... | 04/19/1994 |
| 5289802 | Internal combustion engine having opposed pistons An opposed piston internal combustion engine comprises an output shaft, at least one cylinder, at least one pair of first and second opposed pistons slidable in said cylinder, a first cam connected to the output shaft and a first cam follower assembly con... | 03/01/1994 |
| 5228414 | Valveless two-stroke-cycle oscillating engine A two-stroke-cycle engine has a pivoted divider oscillating within a fan-shaped combustion volume. The divider is connected to a connecting rod which is connected to an output crankshaft. Seals are used instead of piston rings. Each of the two radial wall... | 07/20/1993 |
| 5222463 | Oscillating piston engine An improvement in an internal combustion engine having a rotating annular cylinder which is rotated in a predetermined ratio to oscillation of a plurality of pairs of oscillating pistons in the cylinder, the pistons being so oscillated so that adjacent pi... | 06/29/1993 |
| 5203287 | Oscillating piston engine An internal combustion engine has a rotating annular cylinder containing a plurality of mutually oscillating pairs of pistons, one of each pair being rigidly fixed to a first axially-oscillating tube, the other of each pair being fixed to a second such tu... | 04/20/1993 |
| 5074253 | Volumetric displacement machine with double-action oscillating pistons The motor comprises a casing defining a circular cavity in which a rotor is rotatably mounted. The rotor is keyed to a hollow shaft issuing from the casing. A pair of angularly-spaced radial partitions are fixed to the casing, extend across the cavity and... | 12/24/1991 |
| 4662177 | Double free-piston external combustion engine A free piston combustion chamber coupled to air compression and gas expansion chambers are combined with a rotary motor. The rotary motor shaft drives the air compressor, receives power from the expanding gases in the expansion chamber and provides residu... | 05/05/1987 |
| 4487168 | Machine having oscillating chambers and pistons The machine comprises at least one central pivot 7 angularly fast with a control member 1 and mounted for oscillation on said control member 1 around a direction perpendicular to the axis of the control member 1 and a first eccentric 31 the axis of the ac... | 12/11/1984 |
| 3933130 | Fuel injection cold start and evaporative control system using a bimodal adsorbent bed As cold start is initiated in a spark-ignition internal, fuel injection combustion engine, lower molecular weight constituents fo a full-range gasoline are selectively eluted by an elution system including an adsorbent bed of adsorbent material (cold star... | 01/20/1976 |
