US1292206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet-core.
Assignee: AT&T Inc
•
Filing: 1918-06-28
•
Granted: 1919-01-21
•
Expires: 1938-06-28
Abstract
No abstract record available.
Inventors
- 👤 John C Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:24
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
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) | 1922-01-20 | 1922-07-22 | 1923-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1926-01-20 | 1926-07-22 | 1927-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1930-01-20 | 1930-07-22 | 1931-01-21 | $7700.00 | Window Closed / Lapsed |