...In 1790, the cost to obtain a patent was between $4 and $5.
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5309885 | Marine propulsion device including a fuel injected, four-cycle internal combustion engine An internal combustion engine comprising an engine block including a combustion chamber, a fuel vapor separator, a fuel supply mechanism for introducing fuel to the combustion chamber, a conduit communicating between the fuel vapor separator and the fuel ... | 05/10/1994 |
| 5231967 | Fuel pump and fuel filter for a marine installation An apparatus comprising a fuel pump, an internal combustion engine having an oil pressure and including an engine block and a crankshaft rotatably supported by the engine block, the apparatus further comprising structure for providing a first electrical s... | 08/03/1993 |
| 5057249 | Carburetor float chamber drain device A device for draining carburetors which do not have a float chamber drain. The device is a screw which has an internal passageway. The internal passageway has a longitudinal passageway beginning at the head of the screw and a transverse passageway which c... | 10/15/1991 |
| 5034163 | Modular side-draft carburetor A carburetor comprising a combined float bowl and venturi section including an air passage with a venturi, a rotatably supported throttle valve plate located in the air passage, and a float chamber adapted to contain fuel, and a separate metering section ... | 07/23/1991 |
| 4947807 | Internal combustion engine An internal combustion engine comprising a crankcase adapted to rotatably support a crankshaft having an axis, the crankcase defining a plurality of crankcase chambers and including a generally flat manifold mounting surface including therein a first seri... | 08/14/1990 |
| 4870392 | Fluid flow restriction warning indicator Disclosed is an engine fuel flow restriction warning system comprising an engine including a first conduit means connecting a fuel storage means and a fuel pumping means. A second conduit means connects a fuel pumping means with an engine fuel inlet means... | 09/26/1989 |
| 4825821 | Carburetor pulse-back damping system for 2-cycle internal combustion engine Disclosed herein is a two stroke internal combustion engine comprising first and second alternately fired cylinders, first and second crankcases respectively extending from the first and second cylinders, first and second carburetors respectively includin... | 05/02/1989 |
| 4809666 | Fuel feed system A fuel feed system for supplying fuel to a combustion chamber of a first internal combustion engine and to a combustion chamber of a second internal combustion engine. The fuel feed system includes a fuel tank, and a first fuel pump including an outlet, a... | 03/07/1989 |
| 4800856 | Abrasion resistant roller apparatus for internal combustion engines An engine apparatus comprising an internal combustion engine including a timer plate including thereon a throttle controlling cam, a carburetor mounted on the engine and including a throttle valve, and an actuating lever operably connected to the throttle... | 01/31/1989 |
| 4757792 | Internal combustion engine An internal combustion engine comprising a crankcase adapted to rotatably support a crankshaft having an axis, the crankcase defining a plurality of crankcase chambers and including a generally flat manifold mounting surface including therein a first seri... | 07/19/1988 |
| 4747381 | Marine propulsion device with spark timing and fuel supply control mechanism A marine propulsion device comprising a propulsion unit including a rotatably mounted propeller, and an engine drivingly connected to the propeller and comprising an engine block, a spark timing mechanism, a fuel supply mechanism, a control lever supporte... | 05/31/1988 |
| 4722708 | Marine propulsion device fuel distribution system A marine propulsion installation for use on a boat having an exterior and an interior, the marine propulsion installation comprising an engine, and a rotatably mounted propeller driven by the engine, a source of fuel adapted to be located interiorly of th... | 02/02/1988 |
| 4660516 | Fuel primer and enrichment system for an internal combustion engine An engine comprises a combustion chamber and a fuel transfer passage having a fuel outlet port communicating with the combustion chamber. A primary fuel delivery system communicates with the combustion chamber and introduces fuel from the fuel source into... | 04/28/1987 |
| 4552103 | Manual starter with ignition spark retard A manual starter is provided for an internal combustion engine including a drive member mounted for rotation and operable to start the engine when rotated. The starter includes a flexible pull element mounted for movement between a normally retracted posi... | 11/12/1985 |
| 4542726 | Deceleration enrichment fuel system for an internal combustion engine The internal combustion engine includes a carburetor having an air induction passage communicating with the engine combustion chamber and a throttle valve mounted inside the induction passage for pivotal movement between an idling speed position and a ran... | 09/24/1985 |
| 4498434 | Fuel priming system with integral auxilliary enrichment feature A system for priming and temporarily enriching the air/fuel mixture for a crankcase scavenged, two-cycle engine having a fuel pump supplying fuel to a carburetor for mixture with air for delivery to an induction manifold leading to the engine crankcase wh... | 02/12/1985 |
| 4485767 | Engine overheat warning system An engine overheat warning system for an internal combustion engine, which system includes a source of gas with a pressure different from atmospheric pressure and a pneumatic horn. The engine overheat warning system also includes a conduit communicating b... | 12/04/1984 |
| 4327041 | Carburetor having a concentric tube fuel supply Disclosed herein is a carburetor including a housing having a throat, means for supplying fuel to the throat intermediate its opposite ends, the fuel supplying means including a tube extending into the throat and including a plurality of fuel supply openi... | 04/27/1982 |
| 4286553 | Integrated fuel primer and crankcase drain system for internal combustion engine An internal combustion engine comprises a combustion chamber and a crankcase which extends from the combustion chamber. A primary fuel delivery system introduces fuel from a fuel source into the combustion chamber, and a primer fuel delivery system is sel... | 09/01/1981 |
| 4284040 | Fuel primer for an internal combustion engine An engine comprises a combustion chamber and interior walls which define a fuel induction passage having a fuel outlet port communicating with the combustion chamber. A first fuel delivery system introduces fuel from a fuel source into the combustion cham... | 08/18/1981 |
| 4230085 | Manual starter for internal combustion engines The manual starter for an internal combustion engine includes a flexible pull element mounted in the vicinity of the engine flywheel for movement between a normally retracted position and an extended position and having teeth or cogs adapted to drivingly ... | 10/28/1980 |