US644829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel-economizer.
Assignee: CLAY CROSS COAL LIME AND IRON WORKS
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Filing: 1897-12-21
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Granted: 1900-03-06
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Expires: 1917-12-21
Abstract
No abstract record available.
Inventors
- 👤 David Rushworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:50
CPC Classifications
F; F28; F28G; F28G7/00
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) | 1903-03-06 | 1903-09-05 | 1904-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-03-06 | 1907-09-05 | 1908-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-03-06 | 1911-09-05 | 1912-03-06 | $7700.00 | Window Closed / Lapsed |