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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7439821 | DC to DC transmission system A DC to DC transmission system includes at least three conductors between a source and a sink, a first switch which alternately connects each conductor to the source, a second switch which alternately connects each conductor to the sink. The switches are synchronize... | 10/21/2008 |
| 7231707 | Method of manufacturing planar inductors Method of forming a ferromagnetic layer on at least one surface of a dielectric material that may be serve as an inductive core on a printed circuit board or a multichip module. Conductive leads can form two separate coils around the core to form a transformer, and ... | 06/19/2007 |
| 7158008 | Electronic key system and method The present invention provides an electronic key system including an electrical/electronic key-like device and an electrical/electronic key receptacle capable of receiving a contactless type, contact type, or both types of key-like devices. The present invention fur... | 01/02/2007 |
| 6912921 | Torque detecting device A torque detecting device includes an elastic member disposed between an input shaft and an output shaft of a torque transmitting apparatus, first and second resolvers detecting rotational angles of the elastic member at sides of the input shaft and the output shaft... | 07/05/2005 |
| 6763733 | Rotational angle detecting device, torque detecting device, and steering apparatus A target plate 3 is provided onto a shaft 1 and is has targets 3a arranged on an outer circumference. Facing the outer circumference of this target plate 3 is a sensor 5 that is provided with MR elements, which are arranged ... | 07/20/2004 |
| 6727791 | Capacitive voltage transformer A capacitive voltage transformers for distribution of the power from 10 kv high potential line, includes a insulating column with a high potential terminal, a ground terminal and capacitors C1 and C2 in series connection. The column is filled with oilless dry filler... | 04/27/2004 |
| 6596200 | Electronic material composition, electronic parts and use of electronic material composition Provided is an electronic material composition which is capable of forming a cured film exhibiting a desired glass transition temperature, a desired stiffness modulus in a rubbery state and a desired extensibility at low temperatures. Also provided is an ... | 07/22/2003 |
| 6486665 | Magnetic field sensor having deformable conductor loop segment A magnetic field sensor that can be manufactured using the technology of surface micromechanics, having a conductor loop that has at least one deformable segment; a deformation device for deforming the deformable segment of the conductor loop with a prede... | 11/26/2002 |
| 6323602 | Combination equalizing transformer and ballast choke A ballast circuit includes an equalizer transformer for equalizing current between two or more lamps operated in parallel, combined on one core with a choke. In a 2-lamp embodiment, four windings are provided on one main core. The first and second are clo... | 11/27/2001 |
| 5739738 | Inflatable HI Q toroidal inductor An inflatable high Q toroidal inductor is fabricated from an inflatable tidal-shaped shell made from a flexible material provided with a fitting adapted to receive and vent pressurized gas. A pair of flexible strips are disposed on opposite sides of the ... | 04/14/1998 |
| 5504427 | Rotational position sensor having variable coupling transformer Several embodiments of a rotational position sensor having a variable coupling transformer are disclosed. Each sensor employs at least one magnetically permeable transformer core and a primary and secondary coil. The primary coil in coupled to a time vary... | 04/02/1996 |
| 5497804 | Integral position sensing apparatus for a hydraulic directional valve An apparatus for determining the spool position of a directional valve is disclosed. A longitudinal valve housing has opposed ends and a plurality of fluid ports, and a spool moves reciprocatingly within the valve housing. A first spring disposed adjacent... | 03/12/1996 |
| 5438261 | Inductive sensing apparatus for a hydraulic cylinder In one aspect of the present invention, an apparatus for determining an extended length of a hydraulic cylinder is disclosed. A piston and rod are contained within a cylindrical housing of the hydraulic cylinder. A coil is wound about the rod and is attac... | 08/01/1995 |
| 5367256 | Multi-turn position sensor having variable coupling transformer A multi-turn rotational position sensor. A spirally wound conductor has an inner end coupled to a rotatable shall through a transmission. As the shaft rotates, the spirally wound conductor changes shape. The spirally wound conductor is inductively coupled... | 11/22/1994 |
| 5349321 | Powercord transformer An elongated ferromagnetic core is surrounded by two windings. Optional separators separate the core from the windings and one winding from the other winding. A tube-like ferromagnetic sheath covers the windings and core. The sheath and core are connected... | 09/20/1994 |
| 5278498 | Surface conforming flexible eddy current probe for scanning varying surface contours A flexible core eddy current probe is disclosed for testing of curved or egular surfaces. The core is comprised of a flexible binder loaded with a powdered magnetic material and then formed into a specific flexible core shape continuously adaptable to ir... | 01/11/1994 |
| 5047719 | Flexible coil assembly for reflectance-mode nondestructive eddy-current examination An improved flexible coil array for nondestructive reflective-mode eddy-current testing of conductive members is disclosed. The assembly comprises a flexible substrate having a first array of coils formed on one side thereof. The first array of coils are ... | 09/10/1991 |
| 5007295 | Magnetoelastic force transducer A magnetoelastic force transducer according to the invention comprises two closed magnetic circuits. The transducer is constructed in such a way that the reluctance in one of the magnetic circuits will be changed when the transducer is subjected to a forc... | 04/16/1991 |
| 4980663 | Automated adjustment of air-core coil inductance The inductance value of air-core coils are adjusted using automated methods and inexpensive, noncomplicated apparatus. Adjusting tools are provided which displace coil turns in a linear motion with respect to the coil centerline. Specifically, the coil tu... | 12/25/1990 |
| 4955241 | Magnetoelastic force-measuring device A magnetoelastic force-measuring device is proposed which has an annular thrust body possessing magnetostrictive properties and bearing a ring coil. To enhance the measuring sensitivity in conjunction with simultaneous good thermal error compensation, a s... | 09/11/1990 |
| 4864234 | Transducers and method for making same A transducer for object examination comprises a conductive member of generally disc-shape having an opening of generally triangular configuration extending from the periphery of the member toward its center with opposed sidewalls of the opening in nonpara... | 09/05/1989 |
| 4851798 | Unitary tuning structure A unitary tuning structure of a UHF tuner includes an inductance loop, an inductance adjustment element attached to a top portion of the inductance loop so as to be foldable with respect to the inductance loop about an axis parallel to the printed circuit... | 07/25/1989 |
| 4839585 | Magnetic field sensor coil for being fitted around a motor shaft A magnetic field sensor coil wherein the coil is formed into a shape comprising two generally C-shaped limbs (2, 3) one within the other, one of these limbs being covered by a magnetic screening material (4). In operation an e.m.f. is induced in each turn... | 06/13/1989 |
| 4825056 | Thin-film electromagnetic transducer A thin-film type electromagnetic transducer formed on a nonmagnetic substrate by a thin-film forming process. The transducer includes a magnetic core formed on the substrate by the thin-film forming process, and a conductor coil formed on the substrate by... | 04/25/1989 |
| 4825184 | Current controlled inductor A current controlled inductor (1) having an inductor coil (4) in one state of alteration attached at one end to a displacing coil (6) in an opposite state of alteration to that of the inductor coil (4). Both coils are formed of a shape memory alloy that w... | 04/25/1989 |
| 4802368 | Magnetoelastic force transducer A magnetoelastic force transducer is made of two identical, cylindrical bodies of magnetic material which are held together by means of a stud bolt. In an axially extending and concentrically located inner space there is placed a bobbin with two measuring... | 02/07/1989 |
| 4696192 | Fluid pressure sensor A fluid pressure sensor includes a body made of a soft magnetic material with a groove formed therein, and a coil is installed in the body in the groove. One magnetostrictive disc is placed on the body over the groove, and two non-magnetic discs are place... | 09/29/1987 |
| 4692604 | Flexible inductor Contactless inductive power transfer from a stationary "reader" to energize the electronics on a portable data or "smart" card is made practical through a flexible inductor carried on the card. The inductor, which acts as the secondary portion of a power ... | 09/08/1987 |
| 4675615 | Magnetic amplifier A magnetic amplifier employing a single four-legged ferrite core having orthogonally disposed through holes in the core. Biasing is provided of the magnetic core so as to provide operation in the non-linear parts of the core's hysteresis cycle. A first co... | 06/23/1987 |
| 4631478 | Method and apparatus for using spring-type resistive elements in a measurement bridge circuit A method for converting a movement into an analog or digital variable, in particular into an electrical voltage, and an apparatus for performing the method are proposed. The apparatus includes at least one measuring spring element having windings and fabr... | 12/23/1986 |
| 4625562 | Amorphous magnetic alloy sensor A stress or strain sensor including a magnetic circuit having at least a part constituted by an amorphous magnetic alloy. For detection of the inductance value of the sensor, a DC magnetic field is superposed on an AC magnetic field so that magnetic domai... | 12/02/1986 |
| 4621503 | Pressure sensing devices and methods, control devices and methods of operating same, smart pressure switches, air conditioning systems and devices for controlling same A device for sensing pressure at a source thereof comprising a housing with a fluid pressure responsive diaphragm movable therein for defining therewith an expansible chamber for communication with the source of pressure the magnitude of which is to be se... | 11/11/1986 |
| 4587493 | Coil arrangement An adjustable signal coil, for example a solenoid, saddle or Helmholz type of signal coil which is used in a nuclear spin or NMR examination assembly, includes a pair of adjustable conductor guide and profile supports which hold one or more turns of a con... | 05/06/1986 |
| 4511869 | Radio circuit tuned by adjustably deforming an inductance coil A system and method for adjusting the frequency of operation of a radio frequency circuit including an inductive loop having an adjustable exposed inductor portion is provided. The frequency of operation of the circuit is first detected with means for det... | 04/16/1985 |
| 4474069 | Magnetoelastic transducer A magnetoelastic transducer comprises a plurality of sheets assembled together into a sheet package, the sheet package being provided in known manner with at least one excitation winding and at least one measuring winding. The sheet package comprises firs... | 10/02/1984 |
| 4412454 | Pressure sensing unit for a pressure sensor A pressure sensing unit for a pressure sensor using the magnetostriction effect of a ferrous amorphous magnetic alloy having elasticity which permits magnetostriction, and including an inductance element which has a magnetic core formed at least in part o... | 11/01/1983 |
| 4388593 | Coil device for underwater magnetic testing A coil device for use by divers in subjecting an elongate underwater strure member to a magnetic field for inspection purposes includes a framework supporting a winding having first and second coaxial coils of predetermined coil diameter that lie in subs... | 06/14/1983 |
| 4370576 | Electric generator 1. In an electrical energy generator, the combination comprising a first elongated annular electrical current conductor having at least one bare surface extending longitudinally and facing radially inwards therein, a second elongated annular electrical cu... | 01/25/1983 |
| 4368447 | Rolled core A rolled core is formed by winding a thin body of an amorphous magnetic alloy having positive magnetostriction characteristics so that, of the two surfaces the surface of smaller surface coarseness faces inward. This rolled core is improved in iron loss o... | 01/11/1983 |
| 4348638 | Power measuring apparatus Apparatus for measuring power consumed by a load connected via mains to a source of alternating current having a given fundamental frequency includes means for generating a first signal proportional to the instantaneous voltage across the load and a trans... | 09/07/1982 |
