Patent US3224445A successfully refreshed from Google Patents.
Patent US3544189A successfully refreshed from Google Patents.
US3544189A
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Holography using a poled ferroelectric recording material
Assignee: AT&T Inc
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Filing: 1968-06-12
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Granted: 1970-12-01
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Expires: 1988-06-12
Abstract
No abstract record available.
Inventors
- 👤 Fang-Shang Chen
- 👤 John T Lamacchia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:57
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G11C13/044; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G02F1/0541; G03; G03H; G03H2260/00; G03H2260/50; G03H2260/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3444316A
Cited
US3383664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |