US664526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative hearth-furnace.
Assignee: Individual
•
Filing: 1900-07-02
•
Granted: 1900-12-25
•
Expires: 1920-07-02
Abstract
No abstract record available.
Inventors
- 👤 Eduard Blass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:40
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/06; F23G7/061; F23G7/065; F23G7/066; F23G7/068
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) | 1903-12-25 | 1904-06-25 | 1904-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-12-25 | 1908-06-25 | 1908-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-12-25 | 1912-06-25 | 1912-12-25 | $7700.00 | Window Closed / Lapsed |