Patent US2580083A successfully refreshed from Google Patents.
US2580083A
Expired / Lapsed
US
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Contrast pattern generator
Assignee: AT&T Inc
•
Filing: 1947-10-08
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Granted: 1951-12-25
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Expires: 1967-10-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Stephen Doba
- 👤 John W Rieke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04; H04N17/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22150E
Cited
US2297436A
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US2166688A
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US2183966A
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US2292045A
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US2284219A
Cited
US2409419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |