US1709067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating system
Assignee: AT&T Inc
•
Filing: 1924-10-22
•
Granted: 1929-04-16
•
Expires: 1944-10-22
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:21
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/18; H02J13/333
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1932-04-15 | 1932-10-15 | 1933-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-04-15 | 1936-10-15 | 1937-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-04-15 | 1940-10-15 | 1941-04-16 | $7700.00 | Window Closed / Lapsed |