Patent US3565565A successfully refreshed from Google Patents.
US3565565A
Expired / Lapsed
US
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Apparatus for classifying patterns by frequency analysis of diffraction images
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1967-04-26
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Granted: 1971-02-23
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Expires: 1987-04-26
Abstract
Abstract THE APPARATUS USES A BEAM OF COLLIMATED LIGHT E.G. FROM A LASER, TO PRODUCE A DIFFRACTION IMAGE OF THE PATTERN, E.G. A TRANSPARENT FINGERPRINT. THIS IMAGE IS CYCLICLY SCANNED BY A LIGHT FILTER, E.G. A DISC HAVING TWO CO-LINEAR RADIAL SLITS, AND THE TRANSMITTED LIGHT CONVERTED TO A CYCLICLY VARYING ELECTRICAL SIGNAL. THE SIGNAL IS ANALYSED FOR ITS CONTENT OF A GIVEN FUNDAMENTAL FREQUENCY AND SEVERAL HARMONICS, IN ORDER TO CLASSIFY THE PATTERN BY ITS RELATIVE PROPORTIONS OF EACH FREQUENCY.
Inventors
- 👤 Colin David Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:01
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/88
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |