Patent BE522121A successfully refreshed from Google Patents.
US201439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in apparatus for the production of hot air
Assignee: —
•
Filing: —
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Granted: 1878-03-19
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Expires: 1895-03-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:27
CPC Classifications
F; F24; F24S; F24S70/00; F24S70/60; F24S10/00; F24S10/70; F24S10/80; F24S30/00; F24S30/40; F24S30/42; F24S30/428; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44; Y02E10/47; Y10; Y10S; Y10S165/00; Y10S165/904
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) | 1881-03-18 | 1881-09-17 | 1882-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1885-03-18 | 1885-09-17 | 1886-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1889-03-18 | 1889-09-17 | 1890-03-19 | $7700.00 | Window Closed / Lapsed |