Patent US4837840A successfully refreshed from Google Patents.
US4837840A
Expired / Lapsed
US
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System for verifying authenticity of various articles
Assignee: Light Signatures Inc
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Filing: 1987-02-26
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Granted: 1989-06-06
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Expires: 2007-02-26
Abstract
Abstract Representations are developed that characterize an article for identification by comparison with a reference standard as an escort memory. The representations are reduced to a binary tri-level code covering two extreme possibilities and an intermediate range for indecisive cases. Characteristics are sensed by light in one form by interferometer techniques.
Inventors
- 👤 Robert N. Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:48
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/12; G07F7/127; G06; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/347; G07D; G07D7/00; G07D7/003; G07D7/0032; G07D7/06; G07D7/12; G07D7/121; G07D7/181; G07D7/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A system for developing test values of a substantially binary characteristic of an article that is to be authenticated on the basis of such values representing said characteristic, said system comprising: means to provide scale signals representative of said substantially binary characteristic at a specific location of said article; means for converting said scale signals to one of three representative values of quantized signals, each being indicative of one of three distinct signal ranges encompassing a range approximating substantially average values and one range above and one range below said substantially average values; means for providing said quantized signals in a binary format; and means for rejecting quantized signals for a location of said article representing said range approximating substantially average values.
Claim 2
Independent Claim
122 words
A system for developing test values of a substantially binary characteristic of an article that is to be authenticated on the basis of such values representing said characteristic, said system comprising: means to provide scale signals representative of said substantially binary characteristic at a specific location of said article; means for converting said scale signals to one of three representative values of quantized signals, each being indicative of one of three distinct signal ranges encompassing a range approximating substantially average values and one range above and one range below said substantially average values; means for providing said quantized signals in a binary format; and means for rejecting quantized signals for a location of said article representing said range approximating substantially average values.
Claim 3
Dependent Claim
44 words
A system according to claim 1 wherein said means to provide scale signals includes an interferometer means for providing a light interference pattern modulated by said article and means for providing said scale signals representative of at least a portion of said interference pattern.
Claim 4
Dependent Claim
28 words
A system according to claim 1 wherein said means for providing said quantized signals comprises means for providing binary tri-level coded signals in a two-bit binary code format.
Claim 5
Dependent Claim
25 words
A system according to claim 1 wherein means to provide scale signals comprises an interferometer means for providing a light interference pattern from said surface.
References Cited (Backward Citations)
US3238501A
Cited
US4200394A
Cited
US4218674A
Cited
US4454610A
Cited
US4257264A
Cited
US4450348A
Cited
US4367951A
Cited
US4423415A
Cited
US4647196A
Cited
US4433437A
Cited
US4464786A
Cited
US4661983A
Cited
US4544836A
Cited
US4541113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |