Patent US2249154A successfully refreshed from Google Patents.
US3385927A
Expired / Lapsed
US
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Display device utilizing a medium that alters the degree of refraction of light
Assignee: Stromberg Carlson Corp
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Filing: 1964-08-26
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Granted: 1968-05-28
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Expires: 1984-08-26
Abstract
No abstract record available.
Inventors
- 👤 Omer F Hamann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:52
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7425
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2644938A
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US2932278A
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US2914221A
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US2890923A
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US3016417A
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US3238296A
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US3263029A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |