US3674332A
Expired / Lapsed
US
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Hologram generator using superposition of plane waves
Assignee: AT&T Inc
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Filing: 1970-11-23
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Granted: 1972-07-04
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Expires: 1990-11-23
Abstract
Abstract A SYSTEM WHICH GENERATES HOLOGRAM FROM ELECTRICAL SIGNALS SUPERIMPOSES A SERIES OF LIGHT WAVES IN A THICK HOLOGRAM RECORDING MEDIUM. A PROCESSOR DETERMINES THE AMPLITUDE, PHASE, AND ANGLE OF INCIDENCE OF THE SERIES OF LIGHT WAVES NEEDED TO GENERATE THE HOLOGRAM FROM THE ELECTRICALL SIGNAL. THESE LIGHT WAVES ARE THEN GENERATED WITH AMPLITUDE MODULATION, PHASE MODULATION, AND DE- FLECTION DEVICES, AND ARE MADE TO INTERFERE WITH REFERENCE LIGHT WAVES. THIS CAUSES A SERIES OF INTERFERENCE PATTERNS TO BE SUPERIMPOSED IN THE RECORDING MEDIUM, THEREBY PRODUCING THE HOLOGRAM.
Inventors
- 👤 Herwig Werner Kogelnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:19
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G03H1/04; G03H1/08; G03H2225/00; G03H2225/30; G03H2225/31; G03H2225/32; G03H2225/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |