Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 4886037 | Ignition system for an internal combustion engine To prevent spurious sparks from arising at a spark plug (6) connected to the secondary (3) of an ignition coil upon sudden current rise through the primary (2) when a switching transistor (4) serially connected with the primary becomes conductive, the pri... | 12/12/1989 |
| 4829962 | Procedure for determining optimum ingnition times with regard to engine operation A method and system for determining optimum ignition times with regard to engine operation in which the engine is commanded, at regular, short-time intervals, to operate under conditions which cause knocking in order to be able to sense the knock limit. T... | 05/16/1989 |
| 4827937 | Method and apparatus for controlling the operating characteristic quantities of an internal combustion engine The invention relates to a method and apparatus for controlling operating characteristic quantities of an internal combustion engine. For issuing an uncorrected anticipatory control value, a characteristic field is addressed by directing pregiven operatin... | 05/09/1989 |
| 4774947 | Lithotripsy probe A lithotripsy probe for stone disintegration, comprising a pair of conductors insulated from one another and extending through the probe. The conductors are surrounded by a thin metal sleeve over a distal length of the probe, and the metal sleeve is provi... | 10/04/1988 |
| 4774920 | Idling speed control system for internal combustion engines An idling speed control system for controlling idling rotational speed of an internal combustion engine. A vacuum-operated actuator having a diaphragm defining a vacuum chamber controls opening and closing of a throttle valve in response to pressures supp... | 10/04/1988 |
| 4773378 | Fuel supply control method for internal combustion engines after starting in hot state A method of controlling the supply of fuel to an internal combustion engine after starting, wherein an initial value of a fuel increment is set to a value dependent upon a temperature of the engine after starting thereof, the fuel increment is progessivel... | 09/27/1988 |
| 4770152 | Ignition device for an internal combustion engine An ignition device for an internal combustion engine comprising an ignition coil adapted to produce a secondary reversible voltage, two wires commonly branched from the one end of the ignition coil, and two spark plugs connected to the wires. In each of t... | 09/13/1988 |
| 4768483 | Throttle valve control apparatus for an automobile A throttle valve control apparatus with two electronically-controlled actuators is disclosed. A first electronically-controlled actuator has a first drive motor which opens and closes the throttle valve through gears. A second electronically-controlled ac... | 09/06/1988 |
| 4768489 | Fuel control apparatus A fuel control apparatus comprises a hot-wire type intake air quantity sensor disposed in an air intake passage for an internal combustion engine to detect the quantity of air passing therethrough, a fuel control valve placed in the air intake passage and... | 09/06/1988 |
| 4768485 | Mixture control for an internal combustion engine A mixture control for an internal combustion engine with a lambda probe and with a memory device containing nominal values for the fuel supply dependent on operational values of the engine, as load, rotational speed and temperature. The mixture control re... | 09/06/1988 |
| 4766867 | Fuel supply system for internal combustion engine A fuel supply system of a type for use with an internal combustion engine employs a valve assembly and a circuit for controlling the valve assembly to supply fuel to the engine at a greater or lesser rate respectively in response either to initial closure... | 08/30/1988 |
| 4766868 | Method and apparatus for controlling air-fuel ratio in internal combustion engine In an internal combustion engine having a carburetor fuel system wherein an amount of air bleeding is mixed with the fuel by a feedback control for adjusting an air-fuel ratio, the amount of air bleeding is regulated within a range defined by a minimum gu... | 08/30/1988 |
| 4765306 | Combustion engine stroke identification system A system for stroke identification of an internal combustion engine, comprising first sensor means for detecting given angles of a drive shaft; second sensor means for detecting given angles of a distributor shaft; third processing means for receiving sig... | 08/23/1988 |
| 4765294 | Intake device for internal combustion engine An intake device for an internal combustion engine, in which the intake port is formed to a specific shape without using a partition plate, provided with a valve at its inlet, and the flow direction of intake air to the combustion chambers can be varied b... | 08/23/1988 |
| 4763627 | Learning and control apparatus for electronically controlled internal combustion engine A learning and control apparatus for an electronically controlled internal combustion engine having such an object to be controlled as a fuel injection valve for controlling the air-fuel ratio in an air-fuel mixture or an idle speed control valve for cont... | 08/16/1988 |
| 4763628 | Method of compensating output from oxygen concentration sensor of internal combustion engine Compensation of an output from an oxygen concentration sensor of an air/fuel ratio control apparatus for an internal combustion engine is executed during engine warm-up, to correct for an erroneous component in the oxygen concentration sensor output data ... | 08/16/1988 |
| 4762110 | Ignition control device for internal combustion engine The present invention utilizes, selectively, a first signal formed in a first section of an ignition period composed of the first section and a second section with a predetermined ratio or a second signal formed in the second section according to a ratio ... | 08/09/1988 |
| 4762108 | Non-linear position transducer for detecting the position of a valve controlling the rate of flow of air inducted to the cylinders of a heat engine A non-linear position transducer for detecting the position of a valve controlling the rate of flow of air inducted to the cylinders of a heat engine comprising a first means for detecting the position of this valve, and second means coupled to the first ... | 08/09/1988 |
| 4760830 | Method and apparatus for controlling fuel injection timing in a compression ignition engine The method and apparatus for generating start of combustion signals associated with the combustion events in a diesel engine (10), and for using such signals to control the timing of fuel delivery to the engine. The combustion event is sensed, as by an el... | 08/02/1988 |
| 4759329 | Throttle valve control apparatus for an engine An air-fuel ratio of a gas mixture supplied to a vehicle engine is changed according to predetermined operating conditions. A throttle valve arranged in an intake passage to adjust an intake amount is electromagnetically controlled. If the air-fuel ratio ... | 07/26/1988 |
| 4759331 | Electromagnetically actuatable fuel-injection valve In an electromagnetically actuatable fuel-injection valve for injection systems of internal-combustion engines, the valve has an electromagnet, an armature, and a closure element which is operatively connected to a spring and the armature. The closure ele... | 07/26/1988 |
| 4757793 | Fuel injection control system for internal combustion engine A fuel injection control system for an internal combustion engine having means for limiting a fuel amount to be supplied to the engine according to an output of an air flow sensor to a predetermined upper limit value, and means for correcting the intake a... | 07/19/1988 |
| 4757796 | Carburetor/mixing chamber and dual throttle control and cold starting apparatus for gasoline engine Apparatus including a mixing chamber is installed between a standard carburetor base and the intake manifold of a gasoline engine. The mixing chamber includes an air inlet port for admitting a controlled amount of outside air into the mixing chamber and a... | 07/19/1988 |
| 4756294 | Air-fuel mixture heating device for use with engines An air-fuel mixture heating device for heating an air-fuel mixture supplied from a carburetor to an intake manifold includes an insulator mounted between the carburetor and the intake manifold and having a first air-fuel mixture passage communicating with... | 07/12/1988 |
| 4756281 | Method, and a valving arrangement, for improving air-fuel mixing The method comprises a couple of features: (a) late closing of an air intake valve (for a cylinder) to induce a high-velocity, air injection just before closure, and (b) admitting fuel gas into the cylinder via the air intake valve. The valving arrangemen... | 07/12/1988 |
| 4756285 | Combustion process for internal combustion engine For a combustion procedure for internal combustion engines, in which a fuair mixture with back-fed exhaust gas is introduced into a combustion chamber, a highly-combustible fuel-air mixture without back-fed exhaust gas in introduced into at least one pre... | 07/12/1988 |
| 4754739 | Apparatus for delivering fuel to internal combustion engines A fuel metering apparatus having a metering chamber to hold fuel for subsequent delivery to an engine. A rigid metering member projecting into the chamber linearly movable relative to the chamber to vary the extent of projection of the metering member int... | 07/05/1988 |
| 4753203 | Air/fuel ratio sensor apparatus for use with internal combustion engine An air/fuel ratio sensor apparatus which is capable of detecting deterioration of the sensing elements and correcting the output of the apparatus accordingly. The apparatus includes two sensing elements and a closed compartment of which the two sensing el... | 06/28/1988 |
| 4753210 | Fuel injection control method for internal combustion engines at acceleration A fuel injection control method for an internal combustion engine wherein synchronous fuel injection is effected in synchronism with control pulses generated at predetermined crank angle positions of the engine corresponding to suction strokes of respecti... | 06/28/1988 |
| 4753209 | Air-fuel ratio control system for internal combustion engines capable of controlling air-fuel ratio in accordance with degree of warming-up of the engines While an exhaust gas sensor having an output characteristic linear with respect to the concentration of a specific component in exhaust gases from an internal combustion engine, the opening of an automatic choke valve is controlled in response to the degr... | 06/28/1988 |
| 4750461 | Idling speed control system for internal combustion engines An idling speed control system for controlling idling rotational speed of an internal combustion engine. A vacuum-operated actuator having a diaphragm defining a vacuum chamber controls opening and closing of a throttle valve in an intake passage of the e... | 06/14/1988 |
| 4750460 | Method for detecting fluctuations in the rotational speed of an internal combustion engine The invention discloses a method for detecting rotational speed fluctuations of an internal combustion engine, wherein in a first step it is checked whether the actual speed of the internal combustion engine deviates from a predeterminable desired speed b... | 06/14/1988 |
| 4748953 | Air/fuel ratio control apparatus for internal combustion engines In feedback control for the air/fuel ratio based on a sensor producing an output signal proportional to a change in the air/fuel ratio, a control constant modifier is operative to vary the proportional component and the integration component in a feedback... | 06/07/1988 |
| 4747383 | Ignition timing control method for internal combustion engines An ignition timing control method for an internal combustion engine in which an ignition advance angle value conforming to the operating condition of the engine is set, an ignition timing is obtained by applying an angle-time conversion to a crank angle e... | 05/31/1988 |
| 4747385 | Air-fuel ratio control system for an automotive engine An air-fuel ratio control system has a system for updating data stored in a table at a steady state of engine operation in accordance with output voltage of an O2 -sensor. When the output voltage deviates from a reference voltage corresponding ... | 05/31/1988 |
| 4747389 | Crank angle detecting system for engines A crank angle detecting system for a multicylinder engine includes a disc formed with a large number of slits to detect one-degree crank angular positions and a small number of slits to detect a predetermined piston stroke for each cylinder. Since the wid... | 05/31/1988 |
| 4747379 | Idle speed control device and method An idle speed control method in which a feedback control for controlling the number of idle revolutions to a predetermined value, a learning control for determining a learning value needed to maintain the number of idle revolutions at the predetermined va... | 05/31/1988 |
| 4747382 | Ignition timing control system for internal combustion engines An ignition timing control system for an internal combustion engine comprises magnetic pick-up means for magnetically sensing the angular position of the crankshaft and for generating an output signal indicative thereof, control means for controlling the ... | 05/31/1988 |
| 4747387 | Electronic fuel injection control device for internal combustion engines In an electronic fuel injection control device for an internal combustion engine, an A-D converter is provided to convert an analogue signal indicative of a physical value such as an intake manifold negative pressure or an amount of suction air to a digit... | 05/31/1988 |
| 4744339 | Centrifugal spark-advance control device Disclosed is a centrifugal spark-advance control device for an ignition system of an internal combustion engine, comprising: a base plate which rotates at a speed corresponding to the rotational speed of the engine; a timing plate which is rotatably suppo... | 05/17/1988 |
