Patent US3417249A successfully refreshed from Google Patents.
US3417249A
Expired / Lapsed
US
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Four terminal electro-optical logic device
Assignee: International Business Machines Corp
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Filing: 1963-12-30
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Granted: 1968-12-17
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Expires: 1983-12-30
Abstract
No abstract record available.
Inventors
- 👤 Ivars G Akmenkalns
- 👤 Raymond J Wilfinger
- 👤 Alan D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:21
CPC Classifications
H; H10; H10F; H10F55/00; H10F55/20; H10F55/25; H10F55/255; H03; H03K; H03K17/00; H03K17/94; H03K17/941
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3043958A
Cited
US3217169A
Cited
US3278814A
Cited
US3229104A
Cited
US3304431A
Cited
US3304429A
Cited
US3315176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |