US1633577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coil
Assignee: AT&T Inc
•
Filing: 1925-12-22
•
Granted: 1927-06-28
•
Expires: 1945-12-22
Abstract
No abstract record available.
Inventors
- 👤 Clem H Franks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:52
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127; H01F41/122; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
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) | 1930-06-27 | 1930-12-27 | 1931-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-06-27 | 1934-12-27 | 1935-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-06-27 | 1938-12-27 | 1939-06-28 | $7700.00 | Window Closed / Lapsed |