Patent US2073756A successfully refreshed from Google Patents.
US2073756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timing mechanism
Assignee: AT&T Inc
•
Filing: 1936-03-10
•
Granted: 1937-03-16
•
Expires: 1956-03-10
Abstract
No abstract record available.
Inventors
- 👤 Osten-Sacken Irving Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/12
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) | 1940-03-15 | 1940-09-14 | 1941-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-15 | 1944-09-14 | 1945-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-15 | 1948-09-14 | 1949-03-16 | $7700.00 | Window Closed / Lapsed |