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| Number | Title | Issue Date |
| 4292590 | Magnetometer apparatus with detector immobilized in wax A magnetometer assembly wherein a magnetometer detector suspended from a gimbal is immersed in a wax so as to immobilize the detector. Desired gimbal operation is achieved by heating the wax in the vicinity of the detector.... | 09/29/1981 |
| 4282484 | Combination seismic/magnetic transducer with floating magnet A combination seismic/magnetic transducer capable of detecting movement in a magnetically-permeable body or vibration within the body while it is stopped.... | 08/04/1981 |
| 4258319 | Surface defect detecting apparatus for use with rotating circularly shaped metallic material The surface defect detecting apparatus for rotating cylindrical metal pieces which move in a lengthwise direction relative to a sensor block, has a plurality of eddy-current flaw detecting coils facing the test piece. The sensor block rotates about a hori... | 03/24/1981 |
| 4206391 | Apparatus for tracking a seam Apparatus for tracking a seam between two work members comprising a sensor including a housing with an insulating mounting board therein carrying two first ferrite cores and two second ferrite cores on the upper surface thereof, the two first ferrite core... | 06/03/1980 |
| 4185265 | Vehicular magnetic coded signalling apparatus Coded binary signals are coupled to an automotive vehicle by a magnetic signpost embedded in a traversed roadway lane. The signpost includes polarity coded magnetic pole faces having vertically directed flux lines at differing spaced longitudinal regions ... | 01/22/1980 |
| 4178875 | Apparatuses for producing tight joints or seals in underground pipelines A method of rejoining seals at joints in underground pipelines comprises moving a carriage inside a pipeline beyond a joint to be reformed and rapidly spraying a synthetic polymerizable material to cover the joint from a spraying head mounted on the carri... | 12/18/1979 |
| 4167878 | Apparatus for non-destructively testing materials An apparatus for non-destructively testing materials by ultrasound and eddy current, which includes an ultrasound material testing device operating in conformity with the electrodynamic converter principle, and also includes an eddy current material testi... | 09/18/1979 |
| 4163877 | Housing for circuitry and loudspeaker of a magnetic locator shields and resiliently mounts the loudspeaker A magnetic locator employs a loudspeaker to produce an audible signal which indicates detection of a magnetic object. The loudspeaker is mounted on a frame in a housing and is spring biased against an end wall of a cover part of the housing. Openings thro... | 08/07/1979 |
| 4144494 | Method of magnetically testing tubes during welding wherein the same magnetic field is used both for heating and testing In electromagnetic testing method for tubes is disclosed, which is used during continuous production of tubing from strip being formed into a tube followed by welding the adjoining edges. A magnetic field is applied from the outside, possibly being a fiel... | 03/13/1979 |
| 4138277 | Method and apparatus for producing metal blanks, in particular steel slabs, which at least in a predetermined surface area have substantially no defects Method and apparatus for producing metal blanks, in particular steel slabs, which at least in a predetermined surface area have substantially no defects such as cracks, seams, bubbles, scabs, or the like, at least the surface portion to be made free of de... | 02/06/1979 |
| 4079312 | Continuous testing method and apparatus for determining the magnetic characteristics of a strip of moving material, including flux inducing and pick-up device therefor Continuous testing apparatus for determining the magnetic characteristics of a strip of moving material including a flux inducing and pick-up device to induce a quantity of flux into the material and dual voltage output producing coils for producing diffe... | 03/14/1978 |
| 4068164 | Harmoic flux gate magnetometers and gradimeters and windings An improved ring core second harmonic flux gate magnetometer is constructed as a module for use as a ferrous metal detector. Pairs of modules may also be used as gradiometers. Various uses and winding arrangements on the ring cores are disclosed.... | 01/10/1978 |
| 4048556 | Method for evaluating electrode consumption rate A method for determining the expected consumption rate of graphite electrodes is disclosed. An electrical signal is applied to a number of electrodes to generate eddy currents therein which are sensed to provide eddy current values. The consumption rate o... | 09/13/1977 |
| 4042877 | Inspection apparatus and method for detecting flaws in serially fed substantially cylindrical objects An inspection apparatus for inspecting and detecting flaws in serially fed substantially cylindrical objects. The inspection apparatus includes a notch-shaped inspection station formed by a pair of drive wheels mounted on a first shaft and a pair of disch... | 08/16/1977 |
| 4038596 | Method and apparatus for authenticating a record medium consisting of applying two different strength magnetizing fields and monitoring the remanent fields Apparatus to examine a magnetic storage layer expected to contain a magnetic watermark includes means to magnetize the layer with a unidirectional field of a selected strength without saturating it and means to detect any distinct region of magnetic reman... | 07/26/1977 |
| 4037149 | Multiple mode magnetometers A magnetometer in which at least two modes of drive are employed in exciting sensor and/or sample so that the sensor provides an output indication of magnetic moment which is a function of both drive modes. The drive modes may be periodic at specific driv... | 07/19/1977 |
| 4019130 | Method for measuring wear of cooling cell assembly In a high-temperature furnace such as a heating furnace, a melting furnace or a blast furnace, a cooling cell assembly of a ferromagnetic material such as iron is used in the furnace wall. The thickness of the cooling cell assembly can be detected by wind... | 04/19/1977 |
| 4004693 | Apparatus for inspecting the disposition of steel ply cords in pneumatic tires An apparatus for inspecting the disposition of reinforcing steel ply cords in pneumatic tires. The apparatus can inspect a desired number of tires successively in a full-automatic fashion, classifying the inspected tires at the discharging end of the appa... | 01/25/1977 |
| 3983371 | Apparatus and method for determining the proportion of defective wire in a length of moving wire An apparatus and method are disclosed for determining the proportion of defective wire in a length of wire moving along an established path. The apparatus comprises a first detection means for providing a first signal indication of the rate of travel of s... | 09/28/1976 |
| 3967262 | Line integrated combination magnetic and strain line sensor The disclosed invention pertains to an intruder detection system incorporng paired sensors with minimum sensor balance restraints. The sensor requires as few as three generally parallel trenches and an end trench and thus is suitable for installation by ... | 06/29/1976 |
| 3966047 | Paper currency acceptor A paper currency acceptor which performs a first magnetic test on a first predetermined area of a bill corresponding to an area of a genuine bill printed with magnetic ink to produce a credit signal in response to a genuine bill and to reject a spurious b... | 06/29/1976 |
| 3962627 | Electronic apparatus for testing moving coins employing successive time significant sensings of the effects of proximity of a coin under test to inductive impedance elements upon the effective impedances thereof An improved method and apparatus for testing coins, metallic credit tokens and similar objects, capable of determining both type or denomination and genuineness thereof, utilize the effect upon the electrical impedance of a sensing component from the pres... | 06/08/1976 |
| 3948082 | Method and device for contactless measuring of the thickness of layers, particularly of insulating layers on metallic parts A method and device for contactless measuring of the thickness of layers, particularly of insulating layers on metallic parts whereby a contactless pneumatic servo-mechanism approaches to and maintains a measuring head at a predetermined distance from the... | 04/06/1976 |
| 3943504 | Electric motor direction indicating device A direction indicating device for indicating the direction of rotation of a polyphase A.C. electric motor. A polyphase energy source having a frequency higher than the operating frequency of the electric motor impresses a rotating electromagnetic field in... | 03/09/1976 |
| 3942108 | Digital test instrument A high resolution digital test instrument is provided which has particular, although not exclusive, utility in testing the inductance and inductance changes of wire loops which are embedded in roadways and which are incorporated into vehicle presence sens... | 03/02/1976 |
| 3939404 | Method of testing for and preventing the possibility of cracking, spalling or like defects in rolling mill rolls by determining the rate of change in hardness In a method of testing for and preventing the possibility of cracking, spalling or like defects in a rolling mill roll surface the surface is scanned to provide a representation of the hardness and/or the magnetic conductivity. The presence at a location ... | 02/17/1976 |
