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| Number | Title | Issue Date |
| 4720676 | Magnetomechanical transducer utilizing resonant frequency shifts to measure pressure in response to displacement of a pressure sensitive device A target adapted for use in a magnetomechanical transducer system is activated by an ac magnetic field and a variable dc bias field to produce a resonant frequency which corresponds to the effective strength of the dc bias field. The target includes an el... | 01/19/1988 |
| 4717006 | Coin discriminating apparatus using coil pulses of different lengths Various electrical coin testing arrangements are described which may be used in coin sorters or in coin validators for example. In each arrangement a transmit coil is pulsed with a rectangular voltage pulse and the eddy currents in an adjacent coin under ... | 01/05/1988 |
| 4715442 | Apparatus for servicing tubular strings in subterranean wells A tubing trip tool for use in determining the extent of defects in tubular sections of a continuous tubing string used in subterranean oil and gas wells is disclosed. The tubing trip tool is mounted on a surface rig surrounding the tubing string and defec... | 12/29/1987 |
| 4704579 | Method of distinguishing material characteristics in a well bore for controlling photograph taking in the well bore A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the basis, in part, for a method and an apparatus used ... | 11/03/1987 |
| 4703262 | Mounting structure for spindle orientation magnetic sensor system A magnetic sensor system for spindle orientation in which a magnetic body is attached to a rotating spindle and a magnetic signal from the magnetic body is detected by a sensing unit arranged on a mechanically stationary member to detect the rotational po... | 10/27/1987 |
| 4697460 | Device for measuring torque of a rotary mechanism A torque sensor for electrically detecting torque, such as the torque of an automobile engine, wherein a strain disk is provided in the path of torque transmission and the torque is magnetically detected in terms of the magnetostriction generated in the s... | 10/06/1987 |
| 4698590 | Method and apparatus for measuring velocity of ferromagnetic tubing A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects,... | 10/06/1987 |
| 4697463 | Method of and means for testing flow properties of magnetic toners A method for testing electrostatic developer toners which comprises applying the toner to a stationary non-magnetic sleeve (4), moving the toner along the surface of the sleeve by an array of field lines generally normal to the surface produced by a multi... | 10/06/1987 |
| 4695796 | Magneto-optic measuring device A measuring device includes means for converting a physical quantity to be measured into a corresponding magnetic field. A magnetooptic element is aligned with a polarizer which passes incident light in one plane only. The part of the magnetooptic element... | 09/22/1987 |
| 4694247 | Method and apparatus including a cushion of pulverulent magnetic material for stray field magnetic testing of ferromagnetic parts Elongated ferromagnetic parts of cylindrical or polygonal cross-sectional outline are tested while rotating about their axes and while advancing longitudinally along a cushion of dry pulverulent magnetic material which is supplied by one or more pneumatic... | 09/15/1987 |
| 4688037 | Electromagnetic communications and switching system An electromagnetic communications and switching system provides for line-of-sight remote selection and actuation of a wide variety of apparatus. The system has a plurality of radiating antennas having independent components defining a reference coordinate... | 08/18/1987 |
| 4683427 | Magnetic gear tooth separation detector A gear rattle detector is adapted for use with a gear set having meshing drive and driven gears. The gear rattle detector comprises a magnetic pick-up including a base, a first arm extending from the base and defining a north magnetic pole, a second arm e... | 07/28/1987 |
| 4682104 | Angular displacement pickup, particularly for the detection of torque in power steering The contactless angular displacement and/or torque pickup is characterized in that it comprises two electrically insulating coaxial disks (7a, 7b) that can turn in relation to one another by an angle to be detected and that carry on their opposing faces c... | 07/21/1987 |
| 4678915 | System and process for measuring and correcting the values of a parameter of a sheet material A system for measuring the values of a parameter of a sheet of material is provided. The system includes a head system with sensors mounted therein and a distance correction system to correct the measured parameter for variations in the distance between p... | 07/07/1987 |
| 4678994 | Methods and apparatus employing apparent resonant properties of thin conducting materials Methods and apparatus for sensing, switching and modulating relying upon apparent resonant properties of thin conductive materials are provided in accordance with the teachings of the present invention. According to the present invention, an output of an ... | 07/07/1987 |
| 4676693 | Method of confirming position of drain material left and apparatus for confirming same in drain engineering method A method and apparatus is provided to embed paper drain material in water-laden soil by means of a mandrel driven into the soil by power means. The paper drain material is intermittently treated with a substance detectable by a signal emitted electronic s... | 06/30/1987 |
| 4673878 | Vehicle location display device with averaging means for correcting location information A current location updating display for indicating the current location of moving members such as an automobile while updating from time to time based on output from a magnetic azimuth sensor adapted to detect the azimuth of terrestrial magnetism. Output ... | 06/16/1987 |
| 4665361 | Method and apparatus for the contactless determination of the relative positions of two bodies To determine the relative positions of two bodies, an alternating current is passed through a conductive path in the first body, establishing an alternating magnetic field around the body, the amplitude of the field decreasing in inverse proportion to the... | 05/12/1987 |
| 4661774 | Method and apparatus for monitoring film thickness between rotatable rolls An improved method and apparatus for monitoring the thickness of a film includes a sensor roll which cooperates with a compliant roll to form a nip through which the film passes. As the two rolls rotate relative to each other, magnets disposed in the sens... | 04/28/1987 |
| 4658214 | Magnetic position indicator using multiple probes There are disclosed an improved method of and apparatus for use in monitoring or controlling the positional relationship of two relatively movable members. A leading and a trailing magnetic sensing probe are coupled to one of the members. Each probe is fi... | 04/14/1987 |
| 4657451 | Contact detector for a machine tool A contact detecting system for detecting the contact of a tool element, supported by a main shaft of a machine, with a workpiece comprises exciting and detecting coil assemblies, an electric power source for supplying a high frequency electric current to ... | 04/14/1987 |
| 4649340 | Magnetic differential position sensor To determine the relative position of two objects, for example pistons (16, 22) respectively responsive to the deflection of a brake pedal (10) and actual braking pressure of a wheel of a wheel brake (18) in an automotive power assisted braking system, a ... | 03/10/1987 |
| 4647855 | Pneumetic surface follower with position restoring force Apparatus for measuring thickness, two light measuring heads (2, 3) being mounted by air bearings in housings on either side of the web (1). The measuring heads are provided with specially implemented nozzles blowing against the surface and maintaining a ... | 03/03/1987 |
| 4644274 | Apparatus for supporting an eddy current probe used to scan an irregular surface An invention is disclosed which supports an eddy curent probe at a predetermined distance from a surface to be scanned. In another embodiment, the probe is scanned by rotation about an axis and along an arc of predetermined length and position.... | 02/17/1987 |
| 4641525 | Method and apparatus for checking the wall thickness of a layer In a method of checking the insulating sheath on a wire or cable leaving an extruder, the external diameter of the insulating sheath is continuously determined over the whole circumference by means of a first measuring apparatus and the wall thickness of ... | 02/10/1987 |
| 4641566 | Method for detecting buried land mines by non-destructive means Buried plastic mines or nonmetallic objects are located by spraying a suspected area with a leach of ionized metal and leaching the ionized metal into the soil to leave a metallic concentrate on an impervious object, such as a plastic mine. An array of de... | 02/10/1987 |
| 4635832 | Method of, and an arrangement for casting metal melt In a method of casting a metal melt from a metallurgical vessel, in which the metal melt is covered by a slag layer, into another metallurgical vessel, the metal melt is guided through a casting tube, which covers the casting jet between the vessels. In o... | 01/13/1987 |
| 4631479 | Error locator for high-speed inspection of magnetic tape A novel tape testing apparatus of the type which senses errors, stops the tape, and causes the error to be moved to an error-correction or an error-inspection station. The apparatus of the invention is characterized by means to rapidly try to remove the e... | 12/23/1986 |
| 4604574 | Rotating probe indicating the angle of intersection with a surface The relative orientation of a probe and a surface is maintained by positioning a proximity sensor off-axis on the probe, rotating the probe, and using the signal from the probe to adjust the relative orientation in a feedback loop.... | 08/05/1986 |
| 4598250 | Corrosion sensor device including side-by-side bar magnets surrounded by a coil A corrosion probe is disclosed which includes two permanent bar magnets in side-by-side relation, with opposite magnetic orientation and with poles of opposite polarity adjacent a sensing end of the probe, a sensing coil being disposed around the magnets ... | 07/01/1986 |
| 4596953 | Apparatus for scanning a material for detection of flaws and having material axis deviation detection Apparatus for detecting flaws on the circumference of a rounded bar of metal. A circular rotator means held by a support is rotated around the material to be inspected for flaws. The rotator means has a number of probes which are revolved around the circu... | 06/24/1986 |
| 4591784 | Examination procedure for the spatial change of an object with respect to its initial condition Technical functional components variable relatively to a starting position are examined by comparing an image of the component, produced by relative motion with respect to sensor means, with a corresponding earlier, stored image, and by triggering a warni... | 05/27/1986 |
| 4587486 | Switch for detecting a magnetic field A magnetic-field-dependent inductive proximity switch having a coil arrangement with a ferromagnetic core, which is saturation-sensitive with respect to the magnetic field to be picked up, and having an electronic analyzing circuit for triggering a switch... | 05/06/1986 |
| 4584529 | Method and apparatus for discriminating between genuine and suspect paper money There is disclosed a paper money discriminating method comprising the steps of scanning and detecting magnetism contained in a print portion in a predetermined area of paper money, and checking number of pulses in a pulse signal converted from a magnetism... | 04/22/1986 |
| 4580097 | Electronic proximity sensor which is responsive to induced resistance An improved electronic proximity sensor and crack detector that is primarily responsive to the induced resistance in a coil; including an LC resonating circuit that utilizes constant current and a DC power source. By sensing changes in the induced resista... | 04/01/1986 |
| 4578642 | Method and apparatus for measuring velocity of ferromagnetic tubing A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects,... | 03/25/1986 |
| 4566008 | Fault detecting circuit and method for a vehicle detector system Apparatus and method for a circuit which is connected in series between the call signal output of a vehicle detector and the call signal input of a traffic controller is disclosed. Under normal operating conditions the invention acts as a signal buffer an... | 01/21/1986 |
| 4551677 | Apparatus and method for inspecting a bearing ball A method and apparatus for inspecting the surface of a bearing ball is disclosed which includes a base (A) having a high friction non-abrasive base scanning surface (12). A holding device (B) includes a cone-shaped cup recess (14) in which a ball element ... | 11/05/1985 |
| 4544005 | Can detection and switch mechanism for can filling apparatus A filling apparatus for metal containers has a rotatable bowl carrying filling syrup or other fluid with a plurality of filling valves arranged on the bowl bottom around its periphery to fill empty containers moved into traveling engagement with each valv... | 10/01/1985 |
| 4541771 | Robot having magnetic proximity sensor and manufacturing method using same Described is a robot having a proximity sensor which is based on the reentrant-loop magnetic effect. In one embodiment this sensor in a robot hand can detect the position and orientation of magnetized objects within about a 5 cm range, independently of th... | 09/17/1985 |
