Patent US2421363A successfully refreshed from Google Patents.
US1858725A
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Humidifying system
Assignee: AMERICAN MOISTENING CO
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Filing: 1929-09-04
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Granted: 1932-05-17
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Expires: 1949-09-04
Abstract
No abstract record available.
Inventors
- 👤 Armstrong Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:43
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14
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) | 1935-05-17 | 1935-11-16 | 1936-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-17 | 1939-11-16 | 1940-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-17 | 1943-11-16 | 1944-05-17 | $7700.00 | Window Closed / Lapsed |