Patent US2822422A successfully refreshed from Google Patents.
Patent US1706538A successfully refreshed from Google Patents.
US1706538A
Expired / Lapsed
US
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Testing television and like system
Assignee: AT&T Inc
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Filing: 1927-06-22
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Granted: 1929-03-26
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Expires: 1947-06-22
Abstract
No abstract record available.
Inventors
- 👤 Mertz Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:48
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04; H04N17/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1932-03-25 | 1932-09-24 | 1933-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-03-25 | 1936-09-24 | 1937-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-03-25 | 1940-09-24 | 1941-03-26 | $7700.00 | Window Closed / Lapsed |