US3153172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic brightness control using a light conducting rod and photocell
Assignee: RCA Corp
•
Filing: 1961-05-10
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Granted: 1964-10-13
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Expires: 1981-05-10
Abstract
No abstract record available.
Inventors
- 👤 Ling Ku Sun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:33
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57; H04N5/58; G; G01; G01J; G01J1/00; G01J1/42; G01J1/4204; G01J1/02; G01J1/04; G01J1/0407
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2268498A
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US2310671A
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US2420716A
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US2915659A
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US3040168A
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US3058021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |