US2804870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air furnace humidifier system
Assignee: HUMIDY BOOSTER CO
•
Filing: 1955-02-08
•
Granted: 1957-09-03
•
Expires: 1975-02-08
Abstract
No abstract record available.
Inventors
- 👤 Angelo L Chelini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
F; F24; F24D; F24D5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1713193A
Cited
US1853421A
Cited
US1674337A
Cited
US1812131A
Cited
US1926462A
Cited
US2031220A
Cited
US1866221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |