US3416248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-chemical optical display
Assignee: Sprague Electric Co
•
Filing: 1966-11-02
•
Granted: 1968-12-17
•
Expires: 1986-11-02
Abstract
No abstract record available.
Inventors
- 👤 Charles G Kalt
- 👤 Jr Franklin D Frantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1506; G02F1/153; G09; G09F; G09F9/00; G09F9/30; G09F9/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3096271A
Cited
US3076187A
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 |