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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 |
| 7391201 | Regulated analog switch Circuits and methods to achieve a regulated analog switch being capable to provide an output-voltage not exceeding a defined limit are disclosed. In a preferred embodiment a car battery provides a supply voltage up to 40 Volts, wherein a load must not have an output... | 06/24/2008 |
| 7365503 | Hall Effect sensor temperature compensator A system and method for compensating the output of an uncompensated Hall Effect sensor used to monitor an output shaft of an actuator. The actuator includes an output shaft, a magnet coupled to the output shaft, a motor for rotating the output shaft between a first ... | 04/29/2008 |
| 7358722 | Integrated three-dimensional magnetic sensing device and method to fabricate an integrated three-dimensional magnetic sensing device An integrated three-dimensional magnetic or any field sensing device and a method to fabricate an integrated three-dimensional magnetic sensing device is presented. An integrated three-dimensional magnetic sensing device comprises an apparatus that defines at least ... | 04/15/2008 |
| 7339245 | Hall sensor A Hall sensor on a semiconductor substrate includes a Hall plate in the semiconductor substrate, where the Hall plate includes a first zone having a first conduction type. The semiconductor substrate also include a second zone having a second conduction type. A spac... | 03/04/2008 |
| 7336064 | Apparatus for current measurement The apparatus for measurement of a current which is flowing in an axially elongated electrical conductor at a first electrical potential. The apparatus contains at least one associated sensor element associated with the conductor that is electrically isolated from i... | 02/26/2008 |
| 7319320 | Rotation angle detecting device An improved rotation angle detecting device that detects a rotation angle of a first member relative to a second member is proposed. The rotation angle detecting device includes a magnet unit fixed to the first member and a pair of magnetic sensors fixed to the seco... | 01/15/2008 |
| 7302357 | Concept for compensating piezo-influences on an integrated semiconductor circuit A compensation signal, which derives the mechanical stress, which acts on an integrated semiconductor circuit, from two partial compensation signals, which are generated by semiconductor elements with different stress characteristics, can be determined in more detai... | 11/27/2007 |
| 7221151 | Magnetic array position sensor A sensor apparatus and method that can measure either a linear position or an angular position of a device. A linear array of galvanomagnetic sensing elements is fixedly mountable adjacent the device. A target is connectable to the device such that the target moves ... | 05/22/2007 |
| 7170278 | Device for sensing the axial position, in relation to the other component, of one of two components mobile relative to each other A device (16) for sensing the axial position, in relation to the other component, of one of two components mobile relative to each other, in particular a piston (12) in relation to a cylinder housing (14), which device has a magnetic signal elem... | 01/30/2007 |
| 7135857 | Serially connected magnet and hall effect position sensor with air gaps between magnetic poles Methods and apparatus are provided for measuring the position of an object. The apparatus comprises a magnetic sensor assembly having a magnetic field source, sensor and air gap, and a platen containing a region of position varying magnetic properties that moves thr... | 11/14/2006 |
| 7126330 | Integrated three-dimensional magnetic sensing device and method to fabricate an integrated three-dimensional magnetic sensing device An integrated three-dimensional magnetic or any field sensing device and a method to fabricate an integrated three-dimensional magnetic sensing device is presented. An integrated three-dimensional magnetic sensing device comprises an apparatus that defines at least ... | 10/24/2006 |
| 7034651 | Magnetic field sensing device Two sensor units are formed from magnetoresistive material. Elements of the first sensor unit have a total anisotropy field in a first direction. Elements of the second sensor unit have a total anisotropy field in a second direction. An integral coil sets a directio... | 04/25/2006 |
| 7030601 | Circuit configuration for a gradometric current sensor with a bridge circuit for measuring gradients of magnetic field strength and a sensor equipped with this circuit configuration In order to create a circuit configuration for a gradiometric current sensor with a bridge circuit in the form of a Wheatstone bridge for measuring gradients of the magnetic field strength of a current-carrying conductor, with four magnetoresistive resistors, two of... | 04/18/2006 |
| 7015557 | Hall element with segmented field plate A Hall element is provided with a segmented field plate. Dynamic bias control is applied to the segments of the field plate. In one embodiment, a feedback signal is derived from an amplified output of the Hall element. The feedback signal is applied to the segments ... | 03/21/2006 |
| 7002229 | Self aligned Hall with field plate A self aligned Hall sensor system and method are disclosed. A substrate can be provided. A Hall element and a plurality of contacts can then be formed upon the substrate wherein contacts are located in reference to one another. A field plate formed from polysilicon ... | 02/21/2006 |
| 6950291 | Electromagnetic interference shielding for small magnetic devices The present invention provides magnetic structure, particularly an isolation transformer, which includes a shield to prevent radiation of electromagnetic interference (“EMI”). The magnetic structure includes a support structure, or bobbin, on which are mounted w... | 09/27/2005 |
| 6906514 | Concept for compensating the influences of external disturbing quantities on physical functional parameters of integrated circuits A circuit for generating an output signal, which depends on a physical useful quantity includes means for detecting the physical useful quantity, wherein the means for detecting is arranged to generate an output signal, which depends on the physical useful quantity,... | 06/14/2005 |
| 6316124 | Modified InAs hall elements This invention pertains to more sensitive and more stable electronic devices which can sense electrical and magnetic fields. The devices are characterized by InAs channels confined on both sides thereof by a wide band gap AlSb material; protective layers ... | 11/13/2001 |
| 6291907 | Magnetically coupled signal isolator using a faraday shielded MR or GMR receiving element An isolator having a driver circuit which responsive to an input signal drives appropriate signals into one or more coils which are magnetically coupled to one or more corresponding MR or GMR elements whose resistance is variable in response to the magnet... | 09/18/2001 |
| 6201318 | Headlight warning system A headlight warning system incorporates an engine running sensor and a headlight sensor coupled to a control circuit for activating a warning device, such as a buzzer, when the headlights have been left on for a first period of time after the engine has s... | 03/13/2001 |
| 6154027 | Monolithic magnetic sensor having externally adjustable temperature compensation The current flow from a temperature-variable current source to a Hall-effect element is adjusted according to sensed temperature conditions of the element to compensate for temperature-dependent changes in the magnetic-field sensitivity of the Hall-effect... | 11/28/2000 |
| 6054780 | Magnetically coupled signal isolator using a Faraday shielded MR or GMR receiving element An isolator having a driver circuit which responsive to an input signal drives appropriate signals into one or more coils which are magnetically coupled to one or more corresponding MR or GMR elements whose resistance is variable in response to the magnet... | 04/25/2000 |
| 6040688 | Electrical current supply device with incorporated electrical current sensor A current supply device for supplying a direct current, a sinusoidal current or a pulsed current to a load, the device having a conductor portion arranged for being connected in series with the load, the conductor portion being coupled with a magnetic cir... | 03/21/2000 |
| 5698909 | Multi-function switch A multi-function switch includes a casing, a key top member, two magnets, two magnetic detectors and a micro-computer. The key top member is mounted on the casing to permit both liner movement and rotational movement in a plane parallel with a bottom face... | 12/16/1997 |
| 5686827 | Temperature compensated Hall effect device An apparatus includes a Hall effect device which generates an electrical output signal upon exposure to a magnetic field. An operating current for the Hall effect device is varied by input circuitry to maintain the output signal from the Hall effect devic... | 11/11/1997 |
| 5512818 | Voltage proportional replication device using magnetoresistive sensing elements In accordance with the present invention, a voltage proportional replication device comprises an input electromagnet responsive to an input voltage for producing a magnetic field in proportion to the input voltage; and a first magnetoresistive sensing ele... | 04/30/1996 |
| 5486804 | Integrated magnetoresistive sensor fabrication method and apparatus A magnetoresistor is monolithically integrated with an active circuit by growing a thin film magnetoresistor on a semiconductor substrate after the substrate has been doped and annealed for the active devices. The magnetoresistor is grown through a window... | 01/23/1996 |
| 5264783 | Contactless magnet-activated proportional controller An electrical power controller includes an integrated circuit having a Hall element, a Hall voltage amplifier, a ramp signal generator, and a voltage comparator. The output of the ramp generator is connected to one input of the voltage comparator and the ... | 11/23/1993 |
| 5075605 | Inner-rotor commutation device A brushless DC motor includes a rotor having an iron core affixed to a motor shaft. Permanent magnets are affixed to the core and separated by aluminum inserts which are keyed to the core. An annular groove in one end of the rotor core is dimensioned so t... | 12/24/1991 |
| 5055768 | Temperature compensator for hall effect circuit A resistor formed in the same epitaxial layer of semiconductor material in which a Hall element is formed is used to provide a temperature dependent voltage source which is inversely proportional to the resistance of a temperature sensitive load resistor ... | 10/08/1991 |
| 4994731 | Two wire and multiple output Hall-effect sensor A device for sensing the speed of a rotating element in a vehicle replaces the practice of using magnetic wire coil pickup devices placed in close proximity to a rotating element, such as a gear. The main speed sensing component is a conventional three le... | 02/19/1991 |
| 4931719 | Hall-effect sensor arrangement A Hall-effect magnetic sensor arrangement comprises a sensor element utilizing the Hall-effect and disposed in a magnetic circuit including a magnetic pole unit in an opposing relationship with respect to the magnetic pole unit with a predetermined distan... | 06/05/1990 |
| 4914376 | Actuation device for an electrical appliance The invention is directed to an actuation device for an electrical appliance, in particular for small electrical appliances such as tooth-brushes, oral jet devices, hair dryers, curling irons, shavers and food processors, for the open- or closed-loop cont... | 04/03/1990 |
| 4734594 | Offset correction for sensor with temperature dependent sensitivity A Hall effect device with offset compensation in which the output terminals of a Hall effect element formed in an epitaxial layer are connected to a differential current source. The sum of first and second currents produced by the source is determined by ... | 03/29/1988 |
| 4698522 | Structure for Hall device for compensation of first and second order voltage offsets A Hall device is formed from a generally rectangular body of material exhibiting the Hall effect, with two excitation electrodes disposed along opposite edges of the device. Two Hall output voltage electrodes are disposed along one of the remaining edges ... | 10/06/1987 |
| 4634961 | Method and circuit for the temperature compensation of a hall element A circuit for providing temperature compensation to a Hall element is disclosed. The temperature compensation circuit is used to generate control signals which act on the effective thickness of the current channel of the Hall element in a manner so as to ... | 01/06/1987 |
| 4593241 | Hall generator circuit with temperature compensation A temperature compensating circuit for a Hall generator with a positive temperature coefficient of the resistance of the drive circuit path utilizes summation of a voltage representing the drive current as detected across a substantially temperature-indep... | 06/03/1986 |
| 4521727 | Hall effect circuit with temperature compensation A temperature compensation method and circuit for a Hall element or other element with similar characteristics comprising a pair of current carrying branches, one of which includes a resistor. A pair of transistors in the branches are controlled in unison... | 06/04/1985 |
| 4464625 | Magnetoresistive current detector In a magnetoresistive current detector, which includes a conductor carrying a current to be measured, which in turn generates an external magnetic field, four bridge elements are connected to one another so as to constitute a Wheatstone bridge. The Wheats... | 08/07/1984 |
| 4443716 | Symmetrical-hysteresis Hall switch A magnet is bonded to a skewed-hysteresis Hall switch in such a position that the magnetic flux, normal to the Hall element, is equal to the average of the magnetic flux required to operate and the magnetic flux required to release the Hall switch. This m... | 04/17/1984 |
