US1677967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio signaling system
Assignee: AT&T Inc
•
Filing: 1924-05-29
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Granted: 1928-07-24
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Expires: 1944-05-29
Abstract
No abstract record available.
Inventors
- 👤 William H T Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:11
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027
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) | 1931-07-24 | 1932-01-23 | 1932-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-07-24 | 1936-01-23 | 1936-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-07-24 | 1940-01-23 | 1940-07-24 | $7700.00 | Window Closed / Lapsed |