US3567305A
Expired / Lapsed
US
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Hologram masking techniques
Assignee: AT&T Inc
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Filing: 1966-10-18
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Granted: 1971-03-02
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Expires: 1986-10-18
Abstract
Abstract METHODS AND APPARATUS ARE DISCLOSED FOR INCREASING THE HOLOGRAM STORAGE CAPACITY OF A RECORDING MEDIUM. WITH THE AID OF VARIOUS MASKING TECHNIQUES, EACH HOLOGRAM IS STORED IN A LARGE GROUP OF SMALL AREAS OR VOLUMES DISPERSED THROUGHOUT THE RECORDING MEDIUM, AND AT LEAST SOME HOLOGRAMS ARE STORED IN DIFFERENT GROUPS.
Inventors
- 👤 Robert J Collier
- 👤 Lawrence H Lin
- 👤 Keith S Pennington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:23
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/26; G03H1/22; G03H1/24; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G03H1/2645; G03H1/265; G03H1/2249; G03H2001/2263; G03H1/30; G03H2001/303; G03H2222/00; G03H2222/10; G03H2222/17; G03H2222/18; G03H2223/00; G03H2223/12; G03H2223/26; G03H2250/00; G03H2250/34; Y; Y10; Y10S; Y10S359/00; Y10S359/90
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |