US1410890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for modulating carrier oscillations
Assignee: AT&T Inc
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Filing: 1918-08-08
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Granted: 1922-03-28
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Expires: 1938-08-08
Abstract
No abstract record available.
Inventors
- 👤 John R Carson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:05
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52
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) | 1925-03-27 | 1925-09-26 | 1926-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-03-27 | 1929-09-26 | 1930-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-03-27 | 1933-09-26 | 1934-03-28 | $7700.00 | Window Closed / Lapsed |