US1395378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secret signaling
Assignee: AT&T Inc
•
Filing: 1919-09-29
•
Granted: 1921-11-01
•
Expires: 1939-09-29
Abstract
No abstract record available.
Inventors
- 👤 Richard H Wilson
- 👤 John P Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:23
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/04
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) | 1924-10-31 | 1925-05-02 | 1925-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-10-31 | 1929-05-02 | 1929-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-10-31 | 1933-05-02 | 1933-11-01 | $7700.00 | Window Closed / Lapsed |