Patent US1539924A successfully refreshed from Google Patents.
US1539924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled furnace
Assignee: Individual
•
Filing: 1924-01-03
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Granted: 1925-06-02
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Expires: 1944-01-03
Abstract
No abstract record available.
Inventors
- 👤 Frank H Waite
- 👤 George W Davey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:29
CPC Classifications
F; F23; F23M; F23M5/00; F23M5/08; F23M5/085; F23L; F23L15/00; Y; Y02; Y02E; Y02E20/00; Y02E20/34
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) | 1928-06-01 | 1928-12-01 | 1929-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-06-01 | 1932-12-01 | 1933-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-06-01 | 1936-12-01 | 1937-06-02 | $7700.00 | Window Closed / Lapsed |