Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7426830 | Supercharged internal combustion engine The invention relates to a supercharged internal combustion engine having at least two cylinder groups of at least one cylinder each, both cylinder groups being equipped with an exhaust pipe, and the two exhaust pipes being in communication with one another, and hav... | 09/23/2008 |
| 7171301 | Method and system for detecting an absolute pressure sensor malfunction A method for detecting a malfunction in a manifold absolute pressure sensor used in an internal combustion engine. The method includes obtaining a plurality of samples from the manifold absolute pressure sensor. A plurality of samples is obtained from a mass airflow... | 01/30/2007 |
| 7131263 | Exhaust gas recirculation cooler contaminant removal method and system Method and apparatus for removing contaminants from internal combustion engine exhaust gas recirculation cooler. The method feeds a portion of such exhaust gasses to an input end of an exhaust gas recirculation cooler with such gases flowing through the cooler to ex... | 11/07/2006 |
| 7124019 | Powertrain control module spark duration diagnostic system A system and method for diagnosing ignition system performance of an internal combustion engine. The method operates an engine control unit to produce a sequence of spark ignition current pulses through primary windings of a plurality of ignition coils. The current ... | 10/17/2006 |
| 7058500 | Method and system for determining cylinder position with an internal combustion engine An internal combustion engine having a crankshaft rotatable within an engine block of the engine and at least one camshaft driven by the crankshaft. The crankshaft is fixed to a crankshaft wheel having a plurality of crankshaft wheel marks and at least one crankshaf... | 06/06/2006 |
| 7047729 | Control method and system for diesel particulate filter regeneration A method and system for controlling regeneration in a particulate filter coupled to an internal combustion engine. The method controls hydrocarbon injection into engine exhaust upstream of an oxidation catalyst disposed upstream of the particulate filter in accordan... | 05/23/2006 |
| 7032573 | Method and apparatus for indicating air filter maintenance is required A system and method for indicating required maintenance of an air filter used with an internal combustion engine. The system includes a throttle plate for adjusting an amount of airflow passing into cylinders of the engine. The system includes a throttle plate posit... | 04/25/2006 |
| 6997433 | Electronic valve actuator having vibration cancellation An electronically controlled valve actuator having an armature, a valve, and a coupler for coupling the actuator to the valve with motion of the armature in a first direction moving the second piston in a second direction. The actuator includes an electromagnet, an ... | 02/14/2006 |
| 6988361 | Method and system for controlling simultaneous diesel particulate filter regeneration and lean NOx trap desulfation A method and system for simultaneously regenerating a particulate filter coupled to an internal combustion engine and for desulfating a lean NOx trap disposed downstream of the particulate filter. The method includes adjusting at least one engine operating parameter... | 01/24/2006 |
| 6970781 | Compression ratio mode selection logic for an internal combustion engine having discrete variable compression ratio control mechanism A method and system for operating an internal combustion engine. The internal combustion engine is operable in a plurality of compression ratio operating modes. The method includes determining a relationship between a base engine threshold load where the high compre... | 11/29/2005 |
| 5348934 | Secondary emission cathode having supeconductive oxide material A cathode for a secondary emission structure comprised of a superconductive material is described. In one embodiment the cathode comprises a layer of a superconductive material such as yttrium barium cupric oxide, or rare earth substituted neodymium cupri... | 09/20/1994 |
| 5345201 | Saw device and method of manufacture A low vibration sensitive SAW device includes a first quartz substrate having a pair of opposing surfaces, each surface which supports surface wave propagation. A pair of transducers are coupled to each of said surface wave propagation surfaces providing ... | 09/06/1994 |
| 5345134 | Saw device and method of manufacture A SAW device such as a resonator includes a surface supporting surface wave propagation and a pair of aluminum transducer elements each coupled to said surface wave propagation surface. Each aluminum transducer element is doped with a predetermined amount... | 09/06/1994 |
| 5343071 | Semiconductor structures having dual surface via holes A semiconductor structure having an active layer formed over a first surface of a substrate. The semiconductor structure includes an electrode formed over a first surface of the structure. A conductive layer is formed over a second surface of the substrat... | 08/30/1994 |
| 5337026 | SAW device and method of manufacturing A pair of crystallographically matched piezoelectric substrates are sealed together to provide a package for a SAW device. A sealant material including a glass frit is deposited on a selected portion of a first one of the pair of substrates. The substrate... | 08/09/1994 |
| 5324353 | Zinc sulfide bodies having improved optical transmittance characteristics and mechanical characteristics A method for increasing the optical transmission characteristics of zinc sulfide in the visible and infrared portions of electromagnetic spectrum is described. Materials such as metals and, in particular, transition metals are diffused through the zinc su... | 06/28/1994 |
| 5298906 | Antenna isolation for continuous wave radar systems A radio frequency energy radar system having a transmitting antenna system for transmitting and directing CW radio frequency energy toward a target. A receiving antenna system, adjacent to the transmitting antenna system, receives portions of the transmit... | 03/29/1994 |
| 5281465 | Method of strengthening an optical body by diffusion of material to the depth of structural flaws formed in such body A technique for increasing the strength of long wavelength infrared material, such as zinc sulfide and zinc selenide includes diffusing species which are applied to the materials as thin films into the zinc sulfide and zinc selenide material. Portions of ... | 01/25/1994 |
| 5274389 | Broadband direction finding system An amplitude monopulse direction finding system is disclosed. The system is built around a circular array with a circular lens in which the antenna elements and array ports are larger than in conventional systems. The oversized antenna elements and array ... | 12/28/1993 |
| 5227734 | Broadband bipolar transistor distributed amplifier A distributed circuit includes a plurality of pairs of cascode coupled first and second transistors with each transistor having base, emitter, and collector electrodes. The first transistor of each pair is disposed to have a first one of emitter and colle... | 07/13/1993 |
| 5223458 | Method of manufacturing a III-V semiconductor device using a self-biased substrate and a plasma containing an electronegative species A passivation technique which significantly reduces degradation in reverse breakdown voltage characteristics usually introduced by passivation of active regions of field effect transistors is described. The technique uses a surface treatment in a plasma t... | 06/29/1993 |
| 5221909 | Active load biasing circuit A monopulse antenna system having a four quadrant array of antenna elements and a plurality of summing and differencing amplifiers coupled to the antenna elements for combining signals received by such antenna elements to provide such monopulse antenna wi... | 06/22/1993 |
| 5208504 | Saw device and method of manufacture A SAW oscillator package having low vibration sensitivity includes a stiffener layer disposed between a mounting surface for the oscillator and the oscillator circuit package. Preferably, the stiffening layer comprises a slab of a highly stiff material su... | 05/04/1993 |
| 5208547 | Distributed amplifier having negative feedback A radio frequency amplifier including a plurality of field effect transistors having input electrodes successively coupled by an input propagation network and output electrode successively coupled by an output propagation network is described. The radio f... | 05/04/1993 |
| 5196753 | Surface acoustic wave devices having long-term frequency stability A surface acoustic wave device includes a substrate having a surface which supports surface acoustic wave propagation and having a pair of interdigitated transducers disposed thereon. Each of the pair of interdigitated transducers has a set conductive mem... | 03/23/1993 |
| 5148062 | Simplified phase shifter circuit A phase shifter network which alternates between structurally dual networks is provided. In particular, the phase shifter has a topography which permits the network to be configured as alternatively T or π networks of low pass and high pass delay circuit... | 09/15/1992 |
| 5146297 | Precision voltage reference with lattice damage A precision voltage reference device having a forward biased and reverse biased silicon junctions arranged as a concentric circular annular monolithic structure is described. Selective hardening of the forward biased junction is provided to adjust carrier... | 09/08/1992 |
| 5144413 | Semiconductor structures and manufacturing methods A plurality of microwave semiconductor devices is provided by plating a thin heat sink layer on a surface of a wafer of semiconductor material, masking selected portions of the heat sink layer, and plating unmasked portions of the heat sink layer to form ... | 09/01/1992 |
| 5135814 | Articles and method of strengthening aluminum oxynitride Surface compression layers are provided over aluminum oxynitride by coating a base of said material with a glass frit having a thermal expansion coefficient lower than that of the material, and firing the frit to glass the glass frit after firing the base... | 08/04/1992 |
| 5133006 | Combination interface circuit for coupling a digital loop carrier telephone system A telephone interface circuit for use in a digital loop carrier system. A transformer for coupling analog information and a switch responsive to a hook condition signal is provided. The hook condition signal provides an indication of the "on/off hook" con... | 07/21/1992 |
| 5126751 | Flush mount antenna An antenna capable of being mounted flush with variously shaped surfaces. The antenna comprises a dielectric filled radiating cavity with two opposing tapered walls. The radiating cavity is excited by a microstrip horn.... | 06/30/1992 |
| 5099254 | Modular transmitter and antenna array system A module for constructing a modular transmitter is disclosed. The module contains antenna elements along the front edge of a base. RF circuitry is fabricated on both the top and the bottom sides of the base. The base contains heat pipes to carry heat away... | 03/24/1992 |
| 5099253 | Constant beamwidth scanning array An array antenna system producing beams with widths constant with scan angle. The antenna array is fed by a microwave lens. The beam ports of the lens are disposed along an arc displaced from the focal arc of the lens. The distance between the arc and the... | 03/24/1992 |
| 5091917 | Method and apparatus for pulse sorting A method and apparatus for associating received pulses with one of a plurality of emitters emitting pulses at periodic intervals. Periodic pulse trains are detected by computing the difference in arrival times between each received pulse and a fixed numbe... | 02/25/1992 |
| 5081461 | Correlation detector for FM signals Apparatus for detecting FM signals, such as from a radio altimeter, is disclosed. The apparatus contains a phase detector which has as inputs the received signal and a delayed replica of the input signal. The output of the phase detector is filtered in a ... | 01/14/1992 |
| 5068508 | Complaint hot bar apparatus A surface mount device (SMD) soldering assembly having a hot bar that pivots about a point at the center of its base to accommodate non-uniform surfaces, multi-layer circuit board flatness variations and soldering-lead height differences. The hot bar is m... | 11/26/1991 |
| 5061900 | Self-zeroing amplifier A precision amplifier that, in response to digital inputs, zeros its offset voltage. The precision amplifier comprises a traditional amplifier; a current source controlled by a counter; a comparator; test switches; and control logic. A digital input, such... | 10/29/1991 |
| 5038076 | Slow wave delay line structure having support rods coated by a dielectric material to prevent rod charging A radio frequency amplifier having a slow wave structure supported adjacent an electron beam by a support structure. The support structure includes at least one structural support member, having a supporting rod, and a dielectric material disposed on an o... | 08/06/1991 |
| 4975706 | Radar system A radar system adapted to operate with a selected one of a plurality of pulse repetition intervals to produce a corresponding train of transmitted pulses of radio frequency energy in response to a train of trigger pulses and to receive returns from object... | 12/04/1990 |
| 4944900 | Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality Articles of polycrystalline zinc sulfide and zinc selenide achieve substantially improved optical quality by a treatment of heat and isostatic pressure by means of an inert working fluid. The treated specimens are transparent and have substantial transmis... | 07/31/1990 |
