Patent US731581A successfully refreshed from Google Patents.
US731581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamo-electric machinery.
Assignee: Individual
•
Filing: 1902-07-21
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Granted: 1903-06-23
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Expires: 1922-07-21
Abstract
No abstract record available.
Inventors
- 👤 Henry Leitner
- 👤 Richard Norman Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:08
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46
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) | 1906-06-22 | 1906-12-22 | 1907-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-06-22 | 1910-12-22 | 1911-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-06-22 | 1914-12-22 | 1915-06-23 | $7700.00 | Window Closed / Lapsed |