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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 6964107 | System, method, device and computer code product for improving the readability of an electronic compass A system, method, device and computer code product is disclosed for stabilizing compass heading under tilt error conditions from an uncorrected electronic compass reading. Exemplary embodiments include a stabilizing filter configured to filter out tilt errors incorp... | 11/15/2005 |
| 6466871 | Method for calibrating and verifying the attitude of a compass A method for calibrating the attitude of a compass in relation to the platform on which the compass is installed. The compass includes an attitude determining device and an optical sighting device and the compass is integrally mounted on a platform. The m... | 10/15/2002 |
| 5488778 | Electronic magnetometer and compass An improved electronic magnetometer has a flux-concentrating core making grazing contact with a magnetically conductive element which is preferably part of a piezoelectric transducer. The core and transducer are mounted so as to make non-coherent, chatter... | 02/06/1996 |
| 5339529 | Magnetic sensor mount A magnetic sensor mounting assembly embodying the present invention includes a base plate having cradles for pivotally receiving and adjustably locking a sensor supporting platform thereto. The base plate can be attached to an existing rearview mirror mou... | 08/23/1994 |
| 4977679 | Azimuth signal generator In an azimuth signal generator for an automobile navigation system a change in the rotational rate of an inertia rotary member, which has its rotary shaft held vertically and is driven at substantially a constant speed, is detected as a direction changing... | 12/18/1990 |
| 4916821 | Electronic compass and other magnetic devices Concentrated lines of flux through two loosely mounted magnetically contacting reeds are intermittently mechanically interrupted by breaking the contact infinitesimally, thus deriving a near-maximum generated EMF in a coil surrounding the contact. A piezo... | 04/17/1990 |
| 4442609 | Vehicle orientation detecting device for an automotive vehicle or another vehicle A vehicle orientation detecting device mounted in an automotive or other vehicle cancels an erroneous signal component of a first alternating voltage signal generated as a conductor is rotated so as to intersect a geo-magnetic field. The erroneous compone... | 04/17/1984 |
| 4174577 | Borehole drift-direction probe The invention contemplates use of a single magnetic-field (flux) sensor mounted within an elongate probe housing, to continuously generate telemetered electric signals from which the instantaneous orientation of the housing is at all times known and from ... | 11/20/1979 |
| 4139951 | Remote indicating compass Our invention relates to a novel electromechanical method and apparatus for detecting and representing the north direction and/or the heading of an object or vessel in analog and/or digital representation.... | 02/20/1979 |
| 4013945 | Rotation sensor for borehole telemetry A rotation sensor and output signal processing apparatus is presented. The rotation sensor is a ring core flux gate magnetometer whose output varies as a function of the earth's magnetic field. The phase angle of the second harmonic of the magnetometer ou... | 03/22/1977 |
| 4013946 | Means for determining a first magnetic field direction by measuring secondary magnetic fields induced in a body rotated in said first field A phase-sensitive device for determining the direction of a primary magnetic field is disclosed which includes an electrically conductive rotor mounted for rotation about a predetermined axis. The rotor includes means for defining at least one electrical ... | 03/22/1977 |
