Patent US728575A successfully refreshed from Google Patents.
US728575A
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Transformer.
Assignee: MICHAEL JOSEPH DOHERTY
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Filing: 1902-06-07
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Granted: 1903-05-19
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Expires: 1922-06-07
Abstract
No abstract record available.
Inventors
- 👤 George Hagar Hill
- 👤 Sydney George Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
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) | 1906-05-18 | 1906-11-17 | 1907-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-05-18 | 1910-11-17 | 1911-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-05-18 | 1914-11-17 | 1915-05-19 | $7700.00 | Window Closed / Lapsed |