US843909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmosphere-regulating system.
Assignee: FRANK M PETERS
•
Filing: 1903-06-08
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Granted: 1907-02-12
•
Expires: 1923-06-08
Abstract
No abstract record available.
Inventors
- 👤 Henry H Hungerford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:28
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; Y; Y10; Y10S; Y10S138/00; Y10S138/04; Y10S236/00; Y10S236/13; Y10S261/00; Y10S261/03; Y10S261/34; Y10S261/43
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) | 1910-02-11 | 1910-08-13 | 1911-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-02-11 | 1914-08-13 | 1915-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-02-11 | 1918-08-13 | 1919-02-12 | $7700.00 | Window Closed / Lapsed |