US1771148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Central energy wave signaling system
Assignee: AT&T Inc
•
Filing: 1923-06-29
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Granted: 1930-07-22
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Expires: 1943-06-29
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:47
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02
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) | 1933-07-21 | 1934-01-20 | 1934-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-07-21 | 1938-01-20 | 1938-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-07-21 | 1942-01-20 | 1942-07-22 | $7700.00 | Window Closed / Lapsed |