Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8125221 | Method and device for measuring an angle at which a magnetic field is aligned in a plane relative to a reference axis A device for measuring an angle at which a magnetic field is aligned in a plane relative to a reference axis has at least two magnetic field sensors, which are aligned with their measurement axes in and/or parallel to the plane and oriented at right angles to each o... | 02/28/2012 |
| 7977939 | Non-contact engine parameter sensor A system and method for non-contact engine parameter sensing. A magnetized engine component establishes a magnetic field that varies in response to stress imparted within the engine. A magnetic field sensing element spaced from the magnetized engine component is con... | 07/12/2011 |
| 7309888 | Spin based electronic device A thin film sensing device operates based on a spin polarized current. The spin device includes ferromagnetic layers characterized by different coercivities and/or magnetization states, and one or more low transmission barriers in between. The device is further conf... | 12/18/2007 |
| 7290448 | Physical quantity sensor, lead frame, and manufacturing method therefor A physical quantity sensor is constituted using a lead frame having at least one stage and a plurality of leads whose bases are arranged in the same plane, wherein at least one physical quantity sensor chip having a plurality of electrode pads is mounted on the stag... | 11/06/2007 |
| 6937130 | Magnetic field production system, and configuration for wire-free supply of a large number of sensors and/or actuators using a magnetic field production system A magnetic field production system is proposed and has a two-dimensional winding configuration with two windings. The windings are disposed essentially orthogonally with respect to one another and enclose a machine or system. The windings have winding axes that are ... | 08/30/2005 |
| 6865455 | Magnetic anomaly guidance system and method A system and method for magnetic anomaly guidance is provided. Triaxial magnetometer (TM) sensors are positioned at the vertices of an arrangement with an axis of the arrangement, being defined between each pair of the vertices. The arrangement is positioned on a su... | 03/08/2005 |
| 6821552 | Method and apparatus for determining the pass through flux of magnetic materials The invention includes an apparatus and method for determining the pass through flux of magnetic materials. The apparatus comprises one or more magnetic field sensors arranged in such a way as to collect field strength data in any or all the x, y, z directions. The ... | 11/23/2004 |
| 6577976 | Method for dynamic autocalibration of a multi-sensor tracking system and apparatus incorporating it therein A method for dynamic auto-calibration of a multi-sensor tracking system and apparatus incorporating it therein are presented. The method and apparatus utilize information from complementary sensors, filtered by a simultaneously running filter that combine... | 06/10/2003 |
| 6543550 | Long range electronic guidance system for locating a discrete in-ground boring device A guidance system for a drill tool (1) comprising a primary guidance package and a magnetic solenoid transmitter (9). The primary guidance package contains signal generator. The signal generator produces a signal indicative of the location of the drill to... | 04/08/2003 |
| 6493573 | Method and system for navigating a catheter probe in the presence of field-influencing objects A system for and method of determining and compensating for the effect of a field influencing object on a field sensor, preferably a coil, that is within a navigational domain. The navigational domain contains navigational magnetic energy and disturbing m... | 12/10/2002 |
| 6454911 | Method and apparatus for determining the pass through flux of magnetic materials The invention includes an apparatus and method for determining the pass through flux of magnetic materials. The apparatus comprises one or more magnetic field sensors arranged in such a way as to collect field strength data in any or all the x, y, z direc... | 09/24/2002 |
| 6396263 | Devices and methods for mapping complex magnetic fields through discrete magnetic potential measurements A magnetic potential mapping device is provided by placing a planar polarized light source near an optically active fiber element traversing a magnetic field, so constructed that rotating planar polarized light is transmitted through the optical fiber and... | 05/28/2002 |
| 6387549 | Magnetic sensor A high-sensitivity magnetic sensor capable of detecting a nonequilibrium spin, uses an almost-spin-polarized ferromagnetic oxide in a high-quality trilayer arrangement including an intermediate layer made of a conductive nonmagnetic oxide not reacting wit... | 05/14/2002 |
| 6294911 | Measurement method of magnetization direction of magnetoresistive effect devices and measurement apparatus based on the method of TDK corporation A method of measuring magnetization direction of a MR device, includes a first step of obtaining both maximum electrical resistance values under positive and negative applied measurement magnetic fields onto the MR device biased by anti-ferromagnetic mate... | 09/25/2001 |
| 6195576 | Quantitative magnetoencephalogram system and method A magnetoencephalogram (MEG) method and system for detecting and analyzing the magnetic effects of brain waves uses a dewar having a helmet-shaped cavity and an array of magnetic field detectors arranged in an array. In one embodiment the field detectors ... | 02/27/2001 |
| 6032110 | Lateral positioning detecting apparatus for moving body Markers each comprising an electromagnetic coil are installed on the surface of a road at a lateral center line of a running lane of the road at predetermined intervals. Provided for each of the markers, a driving signal generating circuit drives the asso... | 02/29/2000 |
| 5940003 | Magnetic field sensor for a keyless access system for motor vehicles A magnetic field sensor for a keyless access system, particularly for motor vehicles, wherein the direction of incidence of electromagnetic radiation emitted by a transmitter in the short-range field can be detected. The magnetic field sensor has at least... | 08/17/1999 |
| 5196792 | Proximity detector housing with orientable head A detector having a housing (12), a mounting (3) which is able to adopt four orientations relative to the housing (12), and a detector head (4) which is able to adopt, relative to the mounting (3), two orientations in one of which a sensitive face (29) of... | 03/23/1993 |
| 5187872 | Automatic calibration of magnetic compasses In a magnetic compass of the kind in which a sensor derives coordinates of a sensed magnetic field, automatic correction of hard-iron and soft-iron distortions is achieved by storing a set of measured values of the magnitude of the sensed magnetic field f... | 02/23/1993 |
| 5134369 | Three axis magnetometer sensor field alignment and registration An alignment process is applied to each sensor of an array of three axis magnetic sensors to electronically align the three axes of each sensor after the array has been deployed. The alignment process compensates for each sensor not being aligned perfectl... | 07/28/1992 |
| 4995165 | Roll-independent magneto meter system A roll-independent magnetometer which may be used for example in a towed array magnetometer system comprises a first magnetic field sensor having iso-angular flux sensitivity about a roll axis and a second magnetic field sensor having sensitivity along th... | 02/26/1991 |
| 4785240 | Proximity switch A proximity switch including a base assembly rotatably carries a sensing head formed of a support part rotatable about one axis extending through a base assembly for positioning a sensing face on a complementary sensing part in any one of four planes para... | 11/15/1988 |
| 4731582 | Method and apparatus for correcting alignment errors in a magnetometer system A process for automatically correcting alignment errors between the measuring magnetometers of a magnetic gradient meter, consists in adding to such a gradient meter two additional magnetometers perpendicular to each other and to the axis of the measuring... | 03/15/1988 |
| 4634978 | Magnetometer direction measuring system requiring no external compass A system for accurately measuring the direction in which a magnetometer is to be set has a simple construction and is little affected by iron structures on a hull. The system has a magnetometer which includes an excitation source, a magnetic core, an exci... | 01/06/1987 |
| 4600883 | Apparatus and method for determining the range and bearing in a plane of an object characterized by an electric or magnetic dipole Orthogonal components of electromagnetic field perturbations due to objects characterized by electric or magnetic dipoles are measured along orthogonal axes in a plane. The components are proportional with (3 cos2 θ-1) and (3 cos θ sin θ), w... | 07/15/1986 |
| 4116057 | Pendulous induction compass transmitter with means to compensate for heading errors in turns due to the vertical component of the Earth's magnetic field and due to two cycle error The invention relates to an apparatus for compensating the output of a pendulous induction compass transmitter to eliminate heading errors during turns due to the vertical component of the Earth's magnetic field as well as those due to the horizontal comp... | 09/26/1978 |
| 4027234 | Device for measuring terrestrial magnetic field horizontal components and variations thereof A device is provided for the determination of the components of a terrestrial magnetic field as well as transitory variations therein. Two variometers including permanent magnets, mounted so that there is a constant angle between them, detect the magnetic... | 05/31/1977 |
| 4017791 | Method and apparatus for measuring variations in magnetic field orientations A closed-loop feedback system intermittently orients a gimbaled, quadrature flux gate bearing platform perpendicular to the magnetic field. During intervening periods the loop is opened and a gyroscope preserves this platform orientation. The flux gate ou... | 04/12/1977 |
