US685316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for regenerative furnaces.
Assignee: Individual
•
Filing: 1900-08-08
•
Granted: 1901-10-29
•
Expires: 1920-08-08
Abstract
No abstract record available.
Inventors
- 👤 Henry C Williamson
- 👤 Gomert Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:07
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/02; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10T; Y10T137/00; Y10T137/5544; Y10T137/5617
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) | 1904-10-28 | 1905-04-29 | 1905-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1908-10-28 | 1909-04-29 | 1909-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1912-10-28 | 1913-04-29 | 1913-10-29 | $7700.00 | Window Closed / Lapsed |