Patent US1824827A successfully refreshed from Google Patents.
US1824827A
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US
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Radio signaling system
Assignee: AT&T Inc
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Filing: 1925-09-25
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Granted: 1931-09-29
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Expires: 1945-09-25
Abstract
No abstract record available.
Inventors
- 👤 De Loss K Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:21
CPC Classifications
H; H04; H04H; H04H60/00; H04H60/76; H04H60/78; H04H60/79; H04H20/00; H04H20/65; H04H20/76; H04H20/77
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) | 1934-09-28 | 1935-03-30 | 1935-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-09-28 | 1939-03-30 | 1939-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-09-28 | 1943-03-30 | 1943-09-29 | $7700.00 | Window Closed / Lapsed |