US2502970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device
Assignee: AT&T Inc
•
Filing: 1946-10-11
•
Granted: 1950-04-04
•
Expires: 1966-10-11
Abstract
No abstract record available.
Inventors
- 👤 Robert B Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:57
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T403/00; Y10T403/47; Y10T403/477
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1692074A
Cited
US1994487A
Cited
US1995257A
Cited
US2227212A
Cited
US2372074A
Cited
US2386279A
Cited
US2371613A
Cited
US2392574A
Cited
US2442018A
Cited
US2433098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |