US1933650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system
Assignee: AT&T Inc
•
Filing: 1927-04-06
•
Granted: 1933-11-07
•
Expires: 1947-04-06
Abstract
No abstract record available.
Inventors
- 👤 Henry M Bascom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:20
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/60; H04M3/64
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) | 1936-11-06 | 1937-05-08 | 1937-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-06 | 1941-05-08 | 1941-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-06 | 1945-05-08 | 1945-11-07 | $7700.00 | Window Closed / Lapsed |