Patent US3497188A successfully refreshed from Google Patents.
US3497188A
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Humidifier apparatus and method
Assignee: RICHARD L MCDUFFEE
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Filing: 1968-05-13
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Granted: 1970-02-24
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Expires: 1988-05-13
Abstract
No abstract record available.
Inventors
- 👤 Richard L Mcduffee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:13
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2637540A
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US2739118A
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US2829732A
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US2906512A
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US2986379A
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US3179386A
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US3193259A
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US3272484A
Cited
US3278175A
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US3284068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |