US924409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for heating air or other gases.
Assignee: UNDERFEED STOKER CO Ltd
•
Filing: 1908-11-16
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Granted: 1909-06-08
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Expires: 1928-11-16
Abstract
No abstract record available.
Inventors
- 👤 Wilfred Rothery Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:47
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/04; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S122/00; Y10S122/01
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) | 1912-06-07 | 1912-12-07 | 1913-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-06-07 | 1916-12-07 | 1917-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-06-07 | 1920-12-07 | 1921-06-08 | $7700.00 | Window Closed / Lapsed |