US640796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke-preventing device for furnaces.
Assignee: Individual
•
Filing: 1899-06-10
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Granted: 1900-01-09
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Expires: 1919-06-10
Abstract
No abstract record available.
Inventors
- 👤 Werner Neuhs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:51
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/04; B01D45/08; F; F23; F23J; F23J15/00; F23J15/02; F23J15/022; Y; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S55/00; Y10S55/20
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) | 1903-01-09 | 1903-07-11 | 1904-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-01-09 | 1907-07-11 | 1908-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-01-09 | 1911-07-11 | 1912-01-10 | $7700.00 | Window Closed / Lapsed |