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US716653A
Expired / Lapsed
US
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Balanced-circuit induction-coil.
Assignee: Individual
•
Filing: 1898-03-21
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Granted: 1902-12-23
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Expires: 1918-03-21
Abstract
No abstract record available.
Inventors
- 👤 John P Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:44
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/54; H02M7/58; H02M7/62
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) | 1905-12-22 | 1906-06-23 | 1906-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1909-12-22 | 1910-06-23 | 1910-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1913-12-22 | 1914-06-23 | 1914-12-23 | $7700.00 | Window Closed / Lapsed |