US1748993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coil and method of manufacturing it
Assignee: AT&T Inc
•
Filing: 1926-10-19
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Granted: 1930-03-04
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Expires: 1946-10-19
Abstract
No abstract record available.
Inventors
- 👤 Purdy Chester Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:32
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49073; Y10T29/49075; Y10T29/53; Y10T29/5313
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) | 1933-03-03 | 1933-09-02 | 1934-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-03-03 | 1937-09-02 | 1938-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-03-03 | 1941-09-02 | 1942-03-04 | $7700.00 | Window Closed / Lapsed |