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US3596744A
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US
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Coin-testing apparatus
Assignee: Individual
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Filing: 1969-03-26
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Granted: 1971-08-03
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Expires: 1989-03-26
Abstract
Abstract A coin tester for vending machines in which the coin to be tested forms a core to concentrate the magnetic flux between a first coil provided with a constant voltage AC current, and a second testing or measuring coil in which an EMF is to be induced whereby deviations of the magnetic properties of a coin being tested from the magnetic properties of an acceptable coin will cause a signal actuated by said testing or measuring coil to reject the coin if it is counterfeit.
Inventors
- 👤 Vladimir Yakovlevich Chesnokov
- 👤 Valentin Petrovich Nikitin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:06
CPC Classifications
G; G07; G07D; G07D5/00; G07D5/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
90 words
A coin-testing apparatus of the type wherein acceptability of a coin is determined by the magnetic properties thereof, said apparatus comprising, in combination: a coin passage; two windings arranged around said coin passage one above the other with a spacing therebetween such that said windings have no inductive coupling, the magnetic connection between said windings being established as a coin of ferromagnetic alloy passes between said windings, one of said windings being connected to a source of alternating-current, and the other of said windings being connected to a measuring circuit.
Claim 2
Dependent Claim
90 words
A coin-testing apparatus of the type wherein acceptability of a coin is determined by the magnetic properties thereof, said apparatus comprising, in combination: a coin passage; two windings arranged around said coin passage one above the other with a spacing therebetween such that said windings have no inductive coupling, the magnetic connection between said windings being established as a coin of ferromagnetic alloy passes between said windings, one of said windings being connected to a source of alternating-current, and the other of said windings being connected to a measuring circuit.
Claim 3
Dependent Claim
16 words
An apparatus as defined in claim 1, further including a ferromagnetic screen enveloping both said windings.
References Cited (Backward Citations)
US790641A
Cited
US3373856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |