Celebrity Inventors
Glam girl Heddy Lamar may have used her good looks to good effect on the silver screen, but she put her smarts to better use as an inventor. During World War II, she co-patented a frequency-switching system for torpedo guidance that was considered years ahead of its time.
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| Number | Title | Issue Date |
| 7764155 | Extruder screw with long wearing surfaces A method of extending the life of an extruder screw by affixing tiles of wear-resistant material along the crest of the extruder screw flighting threads, and optionally grinding the hardened material to remove any sharp edges. In another configuration of the present... | 07/27/2010 |
| 7236076 | Electric component having a variable air gap effect An electric component having a variable air gap effect comprises two cores having a magnetic field air gap disposed at the connecting position of the two cores, and a coil wound around the cores and disposed at the installing position of the magnetic field air gap, ... | 06/26/2007 |
| 6940269 | Meter unit having magnetic pointer position detector A speed meter unit has a magnetic pointer position detector, including an output coil, a detection coil and a magnetic piece. The output coil generates magnetic flux. The detection coil is for detecting the magnetic flux from the output coil. When a pointer has retu... | 09/06/2005 |
| 6563412 | Rotary variable differential transformer A rotary variable differential transformer apparatus for determining angular position of a rotor includes a stator support structure, a first pair of magnetically permeable stator elements and a second pair of magnetically permeable stator elements. The f... | 05/13/2003 |
| 6111402 | Position measuring instrument having a scanning element with multiple scanning tracks A scanning element for a position measuring instrument. The scanning element includes a first scanning track disposed within a first region and a second scanning track disposed adjacent to the first scanning track within a second region. An electromagneti... | 08/29/2000 |
| 6043644 | Device for detecting position and movement by using magnetic field variation The present invention concerns the domain of inductive contactless sensors, allowing the position and/or the movement of a target sensitive to a magnetic field to be detected. The invention provides a miniature sensor comprising at least a primary coil ge... | 03/28/2000 |
| 5952896 | Impedance matching network A high efficiency radio frequency (RF) impedance matching network containing an "L-type" inductor-capacitor (LC) circuit where the capacitor is a variable capacitor coupled from an input port to ground and the inductor is a variable inductance inductor co... | 09/14/1999 |
| 5637997 | Angular displacement sensor with movable inductance affecting component An angular displacement sensor for limited angle applications (e.g., for sensing automotive throttle positions) comprising first (14) and second (16) relatively rotatable components arranged to confront each other axially. The first component (14) provide... | 06/10/1997 |
| 5175497 | Measuring device for determination of rotary angle A measuring device for contactless determination of a rotary angle has two movable members which are rotatable relative to one another and two sensor coils whose resistance value to alternating current is varied by relative changes of values of regions of... | 12/29/1992 |
| 5025213 | Device for determining a length of linear movement or an angle of rotation of a machine part A device for determining a length of linear movement of an angle of rotation of a machine part, and comprising spaced first and second bodies, a coil arranged on one of the first and second bodies, and a diaphragm connectable to a machine part for joint d... | 06/18/1991 |
| 4986124 | Screened inductance sensors, especially sensors for level measurement In a screened inductance sensor having a drive winding, a sense winding, and a conductive screen for varying the induced voltage in the sense winding by reason of the eddy currents generated in the conductive screen in the presence of the drive field, a p... | 01/22/1991 |
| 4914390 | Transducer for determining the instantaneous relative angular positions between two members A transducer measures the angular relationship between a drive and a driven member throughout a range of relative angular positions therebetween. The transducer provides a signal indicative of that angular relationship, and the signal can be transmitted t... | 04/03/1990 |
| 4855675 | Inductive transducers for indicating establishment of a preselected spatial relationship between two parts Various forms of hydraulic cylinders having axial bores formed in their piston rods, and probes projecting axially from the closed end of the cylinder body with two spaced coils thereon are disclosed. The coils are connected into external circuitry which ... | 08/08/1989 |
| 4838139 | Musical keyboard A musical keyboard having keys which carry metal spoilers that alter the resonance characteristics of tank circuits associated with the keys as the keys move toward and away from the inductance coils of the tank circuits. The tank circuits are connected s... | 06/13/1989 |
| 4820961 | Linear motion screened inductance sensors In a screened inductance sensor system having a drive winding energizable to set up an alternating magnetic drive field, a sense winding links the drive field and a screening element modulates the spatial distribution of the drive field, when in the vicin... | 04/11/1989 |
| 4794511 | Apparatus and method for generating two-phase signals for use with a resolver to digital converter Two-phase voltage signals for use with a resolver-to-digital converter (RDC) are produced as a periodic function of permeance developed across an air gap between a rotor and stator wherein the permeance varies as a periodic sinusoidal function which can b... | 12/27/1988 |
| 4777436 | Inductance coil sensor An inductance coil sensor in which a rotating spoiler (46) alters the inductance of a stationary coil (1230/1432) having two parts (12a, 12b; 30a, 30b/14a, 14b; 32a, 32b) disposed on opposite sides of the spoiler. Changes in inductance of the stationary c... | 10/11/1988 |
| 4737698 | Position and speed sensors In a sensor having a drive winding for establishing a forward field, an electrically conductive screen is displaceable relative to a sense winding. In the presence of the drive field, eddy currents are generated in the screen to establish a counter-field ... | 04/12/1988 |
| 4507638 | Rotary position sensors employing planar coils A series of rotary sensors are disclosed. Each sensor consists of a drive coil which is a planar coil configuration separated from a sensing coil which is parallel to the drive coil. Interposed between the drive and sensing coils is a rotatable plate fabr... | 03/26/1985 |
| 4425511 | Planar coil apparatus employing a stationary and a movable board A planar coil apparatus is disclosed for providing an output signal indicative of a movement between at least a first and a second position. A first stationary planar member has disposed on a surface, a first flat coil configuration which is emplaced ther... | 01/10/1984 |
| 4358762 | Inductive transducer responsive to displacement along a path The variable inductor and the comparison inductor of a semi-differential variable inductance both have a pair of coils magnetically coupled together. The output current of an amplitude-controlled oscillator flows through the series combination of one coil... | 11/09/1982 |
| 4292489 | Tab heating and applying apparatus An apparatus for applying tabs to end units wherein the tabs are in the form of an aluminum foil-plastic film laminate. A heating dial is provided for receiving tabs, rotating the tabs by indexing, and then applying the tabs. The heating dial includes a r... | 09/29/1981 |
| 4167719 | Variable ratio transformer An adjustable output transformer using a pair of adjacent facing pot cores, the first of which carries both primary and secondary windings, the second having only a shorted winding around one leg. The shorted winding inhibits flux through its leg and the ... | 09/11/1979 |
| 4132980 | High-sensitivity inductive transducer for rectilinear or rotational displacement A core with at least three elongated legs, at least one leg being centrally located among all the elongated legs, is joined at at least one end by a yoke portion connecting all the legs. The central leg or legs is wound with a magnet winding close to the ... | 01/02/1979 |
| 4123735 | Induction-type meter for measuring mechanical quantities An induction-type meter for measuring mechanical quantities, comprising a first converter to convert the controlled parameter into a displacement and having elements adapted to be moved relative to each other, and a second converter to convert the displac... | 10/31/1978 |
| 4080592 | Transducer for vehicular service compensated for accelerator movements of the vehicle An inductive transducer is provided with a core with legs extending in opposite directions from a yoke on which a coil is wound. On the leg portions extending on one side of the coil a short-circuiting ring displaceable in accordance with the displacement... | 03/21/1978 |
| 4075551 | Inductive displacement sensor A variable inductor having a U-shaped magnetic core with a short-circuiting plate providing a short-circuiting ring for both legs of the core movable along the core legs in response to a displacement to be measured is connected in an electronic circuit to... | 02/21/1978 |
| 4039929 | Inductive transducer for rectilinear or rotational displacement The inductance of a coil wound on one end of an elongated rectangular core with an elongated central window is caused to vary by the displacement of a conducting plate or ring arrangement lengthwise of the core. The other end of the core may also be wound... | 08/02/1977 |
| 4013986 | Inductive transducer for rectilinear or rotational displacement The inductance of a coil wound on one end of an elongated rectangular core with an elongated central window is caused to vary by the displacement of a conducting plate or ring arrangement lengthwise of the core. The other end of the core may also be wound... | 03/22/1977 |
| 3991393 | Servomechanism control cylinder An improved servomechanism control cylinder has a housing and a position feedback system contained in the housing. Movement of a piston of the control cylinder moves a shield relative to a fixed electrical coil for changing the signal delivered by the pos... | 11/09/1976 |
| 3955166 | Pulse producing devices A pulse producing device has an E-shaped core with an input winding and an output winding, so that flow of flux between the limbs of the core produces an output in the windings. The flow of flux is controlled by parts rotating close to the limbs, and thes... | 05/04/1976 |
