Patent US2457944A successfully refreshed from Google Patents.
Patent US2454488A successfully refreshed from Google Patents.
US2454488A
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Light modulation by variable transmissivity receiver screen
Assignee: Individual
•
Filing: 1942-02-02
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Granted: 1948-11-23
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Expires: 1962-02-02
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Sukumlyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:44
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)
GB190201A
Cited
GB367300A
Cited
US2020025A
Cited
US2121990A
Cited
US2185379A
Cited
US2185439A
Cited
US2156392A
Cited
US2155465A
Cited
US2281637A
Cited
US2281280A
Cited
US2315113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |