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Patent US2620392A successfully refreshed from Google Patents.
US2620392A
Expired / Lapsed
US
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Black level control in television transmission
Assignee: Pye Electronic Products Ltd
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Filing: 1949-12-15
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Granted: 1952-12-02
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Expires: 1969-12-15
Abstract
No abstract record available.
Inventors
- 👤 Lax Ladislav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR812987A
Cited
FR48431E
Cited
US2303968A
Cited
US2307375A
Cited
US2240490A
Cited
US2286730A
Cited
US2424349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |