US647240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically-driven mechanism.
Assignee: Sprague Electric Co
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Filing: 1899-09-20
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Granted: 1900-04-10
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Expires: 1919-09-20
Abstract
No abstract record available.
Inventors
- 👤 Frank J Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:34
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/68; H02P5/69; H02P5/695
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) | 1903-04-10 | 1903-10-10 | 1904-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-04-10 | 1907-10-10 | 1908-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-04-10 | 1911-10-10 | 1912-04-10 | $7700.00 | Window Closed / Lapsed |