US3703407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relief phase holograms
Assignee: RCA Corp
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Filing: 1970-12-15
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Granted: 1972-11-21
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Expires: 1990-12-15
Abstract
Abstract AN IMPROVED RELIEF PHASE HOLOGRAM IS DESCRIBED WHICH MINIMIZES SIGANL DISTORTION UPON PLAYBACK. THE HOLOGRAM COMPRISES A HOLOGRAPHIC RELIEF PATTERN EMBOSSED ON A POLYMERIC SUBSTRATE SUCH AS A VINYL TAPE AND A COATING ON THE SURFACE OF THE SUBSTRATE DIRECTLY OVER THE RELIEF PATTERN. THE COATING MUST HAVE A THICKNESS OF SOMEWHAT GREATER THAN THE MAXIMUM CONTOUR DEPTH OF THE RELIEF PATTERN AND MUST BE OF A MATERIAL HAVING AN INDEX OF REFRACTION WHICH IS DIFFERENT FROM THAT OF THE SUBSTRATE.
Inventors
- 👤 William James Hannan
- 👤 John Patrick Russell
- 👤 Arthur Herbert Firester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:19
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/0252; G03H1/0256; H; H04; H04N; H04N5/00; H04N5/76; H04N5/89; G03H1/024; G03H1/0244; G03H1/0276; G03H1/028; G03H2250/00; G03H2250/36; G03H2270/00; G03H2270/20; G03H2270/22; G03H2270/23
Claims Analysis
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |