US2804067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved humidifier system
Assignee: Individual
•
Filing: 1954-01-25
•
Granted: 1957-08-27
•
Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 Gustavus S Elgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:58
CPC Classifications
F; F24; F24D; F24D5/00; F24F; F24F6/00; F24F6/02; F24F6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2363953A
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US1206081A
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US1674469A
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US1848327A
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US1786144A
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US1785741A
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US1925601A
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US1932382A
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US2171691A
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US2244126A
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US2328538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |