US2909972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display apparatus employing electro-optical devices
Assignee: International Business Machines Corp
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Filing: 1958-09-15
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Granted: 1959-10-27
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Expires: 1978-09-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Ralph B De Lano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:27
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G02; G02F; G02F1/00; G02F1/01; G02F1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2322602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |