Patent US3894804A successfully refreshed from Google Patents.
Patent US4226323A successfully refreshed from Google Patents.
US4226323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision coin analyzer for numismatic application
Assignee: Individual
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Filing: 1978-09-08
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Granted: 1980-10-07
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Expires: 1998-09-08
Abstract
Abstract A device for testing coins or other metallic articles is disclosed whereby the article to be tested is introduced into the field generated by the inductor of an oscillator and the change in amplitude of the oscillations resulting from the interaction of the field generated and the article to be tested is measured.
Inventors
- 👤 Joseph L. Dautremont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:05
CPC Classifications
G; G07; G07D; G07D5/00; G07D5/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A means of positioning coins within the field of a substantially cylindrical inductor comprising three substantially plane restraining surfaces and a right circular cylinder having first and second bases; the first and second of said surfaces being portions of planes which intersect in a line parallel to the axis of said cylindrical inductor, the third surface being a portion of a plane which intersects the first base of said cylindrical inductor and proceeding in the direction of the second base, forms a vertex with said first and second planes so that a coin moving down the ramp formed by the third surface is restrained in said vertex.
Claim 2
Dependent Claim
107 words
A means of positioning coins within the field of a substantially cylindrical inductor comprising three substantially plane restraining surfaces and a right circular cylinder having first and second bases; the first and second of said surfaces being portions of planes which intersect in a line parallel to the axis of said cylindrical inductor, the third surface being a portion of a plane which intersects the first base of said cylindrical inductor and proceeding in the direction of the second base, forms a vertex with said first and second planes so that a coin moving down the ramp formed by the third surface is restrained in said vertex.
Claim 3
Dependent Claim
35 words
A means of positioning coins within the field of a cylindrical inductor according to claim 1 where the intersection of said first and second planes is within the curved surface of the of said inductor.
Claim 4
Dependent Claim
30 words
A means of positioning coins within the field of a cylindrical inductor according to claim 1 where said descending ramp forms equal dihedral angles with said first and second planes.
Claim 5
Dependent Claim
47 words
A coin positioning receptacle for positioning coins within the field of a substantially cylindrical inductor comprising portions of the three lateral faces of a tetrahedron which would be formed by a base in a plane extending normal to an edge formed by two of the lateral faces.
Claim 6
Dependent Claim
47 words
A coin positioning receptacle for positioning coins within the field of a substantially cylindrical inductor comprising portions of the three lateral faces of a tetrahedron which would be formed by a base in a plane extending normal to an edge formed by two of the lateral faces.
Claim 7
Dependent Claim
34 words
A coin positioning receptacle according to claim 4 in which the plane of the base of said tetrahedron is parallel to the base surfaces of a substantially cylindrical inductor which partially contains said tetrahedron.
Claim 8
Dependent Claim
33 words
A coin positioning receptacle according to claim 5 in which the third lateral face of said tetrahedron forms a descending ramp from the first base of said cylindrical inductor toward the second base.
Claim 9
Independent Claim
113 words
A device for analyzing metallic articles comprising: an inductance capacitance resonant circuit arranged so that said inductance is inductively coupled to the article to be analyzed; a differential input amplifier whose input is connected to the terminals of said inductor, whose output current is connected to a terminal of said inductor so as to increase the amplifier input voltage and whose current level can be adjusted; a feedback metering circuit comprising a differential amplifier incorporating rectifying and filtering means, a feedback network coupling a portion of the amplifier output current to an input of said amplifier to reduce the output current and a meter connected to measure the output current of said amplifier.
Claim 10
Independent Claim
113 words
A device for analyzing metallic articles comprising: an inductance capacitance resonant circuit arranged so that said inductance is inductively coupled to the article to be analyzed; a differential input amplifier whose input is connected to the terminals of said inductor, whose output current is connected to a terminal of said inductor so as to increase the amplifier input voltage and whose current level can be adjusted; a feedback metering circuit comprising a differential amplifier incorporating rectifying and filtering means, a feedback network coupling a portion of the amplifier output current to an input of said amplifier to reduce the output current and a meter connected to measure the output current of said amplifier.
Claim 11
Dependent Claim
33 words
A device for analyzing metallic articles according to claim 7 wherein said feedback network includes a means for adjusting the amount of the amplifier output current coupled to the input of said amplifier.
Claim 12
Dependent Claim
32 words
A device for analyzing metallic articles according to claim 7 which includes a means of establishing a constant level of current through said meter to verify that the device is turned on.
Claim 13
Dependent Claim
50 words
A device according to claim 7 wherein the current output of the differential amplifier is connected to said metering circuit and where the current level of said differential amplifier can be increased to cause deflection of said meter to a standard point and provide a self-test capability for the device.
Claim 14
Independent Claim
67 words
A method for measuring alternating currents comprising the steps of amplifying the difference between the alternating voltage to be measured and a direct voltage, rectifying and filtering the amplified difference, feeding back a portion of said amplified and filtered voltage to the direct voltage input of said amplifier so as to reduce said amplified and filtered voltage and measuring the magnitude of said amplified and filtered voltage.
Claim 15
Independent Claim
67 words
A method for measuring alternating currents comprising the steps of amplifying the difference between the alternating voltage to be measured and a direct voltage, rectifying and filtering the amplified difference, feeding back a portion of said amplified and filtered voltage to the direct voltage input of said amplifier so as to reduce said amplified and filtered voltage and measuring the magnitude of said amplified and filtered voltage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |