Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 6975665 | Low power, high resolution timing generator for ultra-wide bandwidth communication systems An ultra wide bandwidth communications system, method and computer program product including an ultra wide bandwidth timing generator. The timing generator includes a high frequency clock generation circuit having low phase noise; a low frequency control generation ... | 12/13/2005 |
| 6832507 | System for detecting the presence of moisture The system comprises at least one electronic sensor for detecting the presence of moisture. The system further comprises at least one reading device for obtaining information from the sensor about the presence of moisture. The sensor comprises a resonant circuit whi... | 12/21/2004 |
| 6583630 | Systems and methods for monitoring wear and/or displacement of artificial joint members, vertebrae, segments of fractured bones and dental implants A distance measurement system is provided. The distance measurement system includes at least one resonant circuit, at least one magnetic element with predetermined magnetic properties, a transmitter operable to transmit an electromagnetic pulse, a receive... | 06/24/2003 |
| 6528859 | Foil wound low profile L-C power processor The present invention provides a foil wound low profile power L-C processor. A magnetic winding is disposed within a core. The magnetic winding can be made of one or more sets of conductive foil and insulation film wound together in a spiral pattern. The ... | 03/04/2003 |
| 6366096 | Apparatus and method for measuring of absolute values of penetration depth and surface resistance of metals and superconductors An apparatus and method for accurately estimating the absolute value of surface resistances and penetration depths of metallic films and bulk samples. The apparatus carries out measurements using two nominally identical samples with flat sample surfaces w... | 04/02/2002 |
| 6345228 | Road vehicle sensing apparatus and signal processing apparatus therefor A road vehicle sensor provides an output signal having a magnitude which varies with time through a plurality of values as a vehicle passes the sensor. Signal processing apparatus monitors the timing of sensor signals generated from sensors in adjacent la... | 02/05/2002 |
| 6242938 | Electrical circuit to detect load current An electric circuit for determining the load current of a clocked load having at least one inductive component and being assigned a free-wheeling circuit has a shunt whose voltage drop is used to determine the current. The shunt is arranged in the free-wh... | 06/05/2001 |
| 6025725 | Electrically active resonant structures for wireless monitoring and control A planar electromagnetic resonator utilizes an electromagnetically active material located between the capacitive or inductive elements of the resonator. A microscopic electrical property of this material is altered by an external condition, and that alte... | 02/15/2000 |
| 5869958 | Method of and apparatus for determining a response characteristic A method of determining a response characteristic of a microwave device includes coupling a microwave resonator to the device, loading the resonator with microwave radiation, monitoring the time decay of power from the resonator, and comparing the monitor... | 02/09/1999 |
| 5420518 | Sensor and method for the in situ monitoring and control of microstructure during rapid metal forming processes An electronic resonator is employed for the on-line nondestructive measurement of microstructure, as defined by the diameter of grains of the type found in ferritic steel alloys during high rate formation processes. The quality factor (Q) of an inductive-... | 05/30/1995 |
| 5397993 | Method for measuring the material moisture content of a material under test using microwaves A process and a device for determining the moisture content of the material of a test object using microwaves. The properties of a resonator such as resonance frequency, resonance half-width value and amplitude of the resonance can be measured using a dig... | 03/14/1995 |
| 5142228 | Method for statically or dynamically monitoring the thickness of electrically-conductive coatings on optical fibers Method and apparatus for non-destructively monitoring the thickness and uniformity of electrically conductive coatings (12) that have been deposited upon optical waveguide fibers (10). The monitoring may be performed while coated fiber (22) is at rest or ... | 08/25/1992 |
| 5072186 | Method and apparatus for interturn and/or interlayer fault testing of coils An electric coil to be tested for interturn and/or interlayer faults is coupled into a series resonant circuit. A measurement of the quality-factor (Q-factor) is carried out by measuring the overshoot voltage in circuit resonance. Through the selection of... | 12/10/1991 |
| 4968945 | Open tube resonator test setup for conductivity measurements An apparatus and method for measurement of ohmic loss and surface resistivity is provided with a straight lumen waveguide with at least one opening at one end. Diffraction of radiation introduced to the lumen at one end of the tube provides feedback to es... | 11/06/1990 |
| 4833396 | Lead frame short tester Disclosed herein is a method and apparatus for performing a non-invasive electronic testing of hybrid circuit packages before components are mounted within the package and connected to the outwardly extending wired leads. The testing process disclosed her... | 05/23/1989 |
| 4810950 | Load resistance measuring technique The resistance of an inductive load is measured by connecting an inductor to the load and applying a pulse of energy to the load and the inductor. The voltage across the inductor is monitored and the load voltage and current are measured when the inductor... | 03/07/1989 |
| 4797614 | Apparatus and method for measuring conductance including a temperature controlled resonant tank circuit with shielding A meter for sheet conductance measurements does not touch the conductive surface of a sample. A probe having a resonant tank coil is positioned against a parallel supporting surface of the sample, which may be flat or curved and of unrestricted area. An o... | 01/10/1989 |
| 4777430 | Circuit for determining the effective series resistance and Q-factor of capacitors A meter circuit for measuring the effective series resistance (ESR) and Q-Factor of a capacitive device has an operational amplifier with an input to which a source of AC input voltage is applied. A feedback circuit is connected between output and input o... | 10/11/1988 |
| 4659983 | Method and apparatus for detecting a shorted SCR The inductors in an induction heating apparatus are arranged in parallel branches with an SCR in series with each inductor and an RC snubber circuit in parallel with each inductor. If an SCR becomes shorted the faulty SCR is detected by a method and appar... | 04/21/1987 |
| 4629977 | Method and apparatus for measuring the resonant frequency of a high Q resonator A resonator is initially charged by applying a drive signal offset from the expected resonant frequency of the resonator for a selected period of time. After the drive signal is removed from the resonator a period counter is used to count the period of th... | 12/16/1986 |
| 4419623 | Reactance meter A circuit capable of measuring the value of an unknown reactance over a wide range of values resonates the unknown reactance with a known reactance value of opposite type by means of an operational amplifier. An adjustable feedback resistance connected be... | 12/06/1983 |
| 4394617 | Swept-dip probe The present invention relates to the design and fabrication of a probe, ancillary signal conditioning circuits with display circuits and related equipment required to measure the resonate frequency and display the shape of the resonance curve. The probe u... | 07/19/1983 |
| 4136313 | Apparatus for measuring Q-quality of oscillatory circuit components An apparatus for measuring the Q-quality of oscillatory circuit components includes a control unit electrically coupled to a high-frequency generator connected to a frequency modulator having its output connected to a measuring unit. The measuring unit is... | 01/23/1979 |
| 4110686 | Piezoelectric-tuned microwave cavity for absorption spectrometry Gas samples are analyzed for pollutants in a microwave cavity that is provided with two highly polished walls. One wall of the cavity is mechanically driven with a piezoelectric transducer at a low frequency to tune the cavity over a band of microwave fre... | 08/29/1978 |
| 4075557 | Contactless facilities for determining the specific resistance of a test sample A rapid and accurate technique for generating indications representative of the specific resistance of a test sample, such as a silicon disc, is described. A capacitive probe is electrostatically coupled to the sample, and the input terminals of the probe... | 02/21/1978 |
| 3953796 | Method and apparatus for measuring electrical conductivity Method and apparatus for measuring the conductivity of material such as semiconductor discs which are coupled capacitively to a high frequency resonant circuit so as to dampen the circuit. The resonant circuit is designed as a tank circuit of high quality... | 04/27/1976 |
| 3946308 | Dielectric apparatus and method utilizing resonance for humidity measurement Apparatus for humidity measurement employing a dielectric resonator consisting essentially of a metallic guard, a solid dielectric material, an input antenna and an output antenna. Method of measuring humidity comprising feeding a microwave energy of swept ... | 03/23/1976 |
