US2547648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic contrast control system for television apparatus
Assignee: Hazeltine Research Inc
•
Filing: 1949-10-08
•
Granted: 1951-04-03
•
Expires: 1969-10-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur V Loughren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:49
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/165; H04N5/21; H04N5/213; H04N5/44; H04N5/52; H04N5/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2135942A
Cited
US2307387A
Cited
US2328946A
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US2224134A
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US2135560A
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US2227026A
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GB505899A
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US2244240A
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US2303909A
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US2307375A
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US2307218A
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US2259538A
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US2296393A
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US2299944A
Cited
US2299945A
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US2469606A
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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) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |