US4558224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterfeit bill warning device
Assignee: IMPERIAL Inc
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Filing: 1983-05-26
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Granted: 1985-12-10
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Expires: 2003-05-26
Abstract
Abstract According to the invention, a device for detecting counterfeit paper currency is provided which utilizes the characteristic fluorescence of genuine paper currency to detect counterfeit paper currency. An ultraviolet lamp illuminates the paper currency of unknown origin which the currency is placed on a stage held in fixed relationship to the ultraviolet lamp by a housing. A sensor circuit responds to the fluorescent radiation from the paper currency to give a signal to an indicator which displays an indication of the fluorescence of the unknown paper currency relative to genuine paper currency. The sensor is a photoresistor and the indicator is a variable intensity light or a digital display.
Inventors
- 👤 Jerome T. Gober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:55
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/06; G07D7/12; G07D7/128
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
154 words
A device for detecting counterfeit paper currency utilizing the characteristic fluorescence of genuine paper currency, said device comprising, an ultraviolet lamp for illuminating paper currency to be tested, a housing supporting said ultraviolet lamp, a stage supporting the paper currency, said stage being mounted to the housing and illuminated by the ultraviolet lamp, a sensor mounted within the housing and responsive to the fluorescent radiation from the paper currency for providing a variable signal proportional to the intensity of the fluorescence, and means responsive to the variable signal from said sensor for providing a physical indication of the degree of fluorescence of the paper currency including adjustable means for providing a first threshold signal corresponding to the fluorescence of genuine paper currency, means for providing a second signal corresponding to the fluorescence of the illuminated paper currency, and a variably responsive indicator which responds to second signal in excess of the first threshold signal.
Claim 2
Independent Claim
154 words
A device for detecting counterfeit paper currency utilizing the characteristic fluorescence of genuine paper currency, said device comprising, an ultraviolet lamp for illuminating paper currency to be tested, a housing supporting said ultraviolet lamp, a stage supporting the paper currency, said stage being mounted to the housing and illuminated by the ultraviolet lamp, a sensor mounted within the housing and responsive to the fluorescent radiation from the paper currency for providing a variable signal proportional to the intensity of the fluorescence, and means responsive to the variable signal from said sensor for providing a physical indication of the degree of fluorescence of the paper currency including adjustable means for providing a first threshold signal corresponding to the fluorescence of genuine paper currency, means for providing a second signal corresponding to the fluorescence of the illuminated paper currency, and a variably responsive indicator which responds to second signal in excess of the first threshold signal.
Claim 3
Dependent Claim
30 words
A device for detecting counterfeit paper currency as set forth in claim 1 wherein said sensor comprises a photocell sensitive to the degree of fluorescent radiation from illuminated paper currency.
Claim 4
Dependent Claim
21 words
A device for detecting counterfeit paper currency as set forth in claim 1 wherein said indicator is a variable intensity light.
Claim 5
Dependent Claim
20 words
A device for detecting counterfeit paper currency as set forth in claim 1 wherein said indicator is a digital display.
Claim 6
Dependent Claim
37 words
A device for detecting counterfeit paper currency as set forth in claim 1 wherein said sensor causes a variable voltage proportional to the intensity of the fluorescence of illuminated paper currency to be delivered to said indicator.
Claim 7
Dependent Claim
25 words
A device for detecting counterfeit paper currency as set forth in claim 1 wherein said indicator means and said sensor comprises a voltage divider circuit.
Claim 8
Dependent Claim
32 words
A device for detecting counterfeit paper currency as set forth in claim 6 wherein said voltage divider circuit includes a photocell resistor which is responsive to the fluorescence of illuminated paper currency.
Claim 9
Dependent Claim
27 words
A device for detecting counterfeit paper currency as set forth in claim 6 wherein said indicator is responsive to a voltage node in said voltage divider circuit.
Claim 10
Dependent Claim
34 words
A device for detecting counterfeit paper currency as set forth in claim 8 wherein the voltage at said voltage node in said voltage divider circuit is proportional to the fluorescence of illuminated paper currency.
Claim 11
Dependent Claim
46 words
A device for detecting counterfeit paper currency as set forth in claim 8 wherein said indicator has a threshold voltage and said adjustable means includes a variable resistance of said voltage divider circuit for adjusting the voltage level at said voltage node to said threshold voltage.
Claim 12
Dependent Claim
44 words
A device for detecting counterfeit paper currency as set forth in claim 10 wherein said voltage node of said voltage divider network exceeds said threshold voltage only in response to fluorescence from illuminated paper currency which is greater than the fluorescence of genuine currency.
Claim 13
Dependent Claim
39 words
A device for detecting counterfeit paper currency as set forth in claim 1 wherein said sensor comprises a photocell sensitive to the fluorescent radiation from illuminated paper currency and a polarizing lens positioned between said stage and said photocell.
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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |