US2444737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coil
Assignee: AT&T Inc
•
Filing: 1944-04-11
•
Granted: 1948-07-06
•
Expires: 1964-04-11
Abstract
No abstract record available.
Inventors
- 👤 Herbert P Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:22
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1633577A
Cited
US1837733A
Cited
US1932640A
Cited
GB375507A
Cited
US1888275A
Cited
US1998827A
Cited
US2013686A
Cited
US2118924A
Cited
US2349952A
Cited
US2313234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |