Patent US2584650A successfully refreshed from Google Patents.
US2584650A
Expired / Lapsed
US
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Humidifier for heated air ducts
Assignee: Individual
•
Filing: 1948-09-08
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Granted: 1952-02-05
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Expires: 1968-09-08
Abstract
No abstract record available.
Inventors
- 👤 Woodruff Clarence Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:51
CPC Classifications
B; B05; B05B; B05B12/00; B05B12/08; B05B12/12; B05B1/00; B05B1/30; B05B1/3033; B05B1/304; B05B1/3046; B05B1/3053; F; F24; F24F; F24F6/00; F24F6/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1574856A
Cited
US656902A
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US869434A
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US890970A
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US1626360A
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US1640564A
Cited
US2020144A
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US2093444A
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US2177111A
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US2187778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-04 | 1955-08-06 | 1956-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-04 | 1959-08-06 | 1960-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-04 | 1963-08-06 | 1964-02-05 | $7700.00 | Window Closed / Lapsed |