US3509348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical memory device utilizing metal semiconductor phase transition materials
Assignee: AT&T Inc
•
Filing: 1967-09-18
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Granted: 1970-04-28
•
Expires: 1987-09-18
Abstract
No abstract record available.
Inventors
- 👤 William S Boyle
- 👤 Hans W Verleur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:27
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11C; G11C13/00; G11C13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3020406A
Cited
US3183359A
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US3270291A
Cited
US3271578A
Cited
US3351698A
Cited
US3415996A
Cited
US3406299A
Cited
US3402300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |