Patent US2379838A successfully refreshed from Google Patents.
Patent US3464188A successfully refreshed from Google Patents.
US3464188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier and humidifier
Assignee: Individual
•
Filing: 1967-11-22
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Granted: 1969-09-02
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Expires: 1987-11-22
Abstract
No abstract record available.
Inventors
- 👤 Henry P C Keuls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F6/00; F24F6/02; F24F6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US458538A
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US2715056A
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US1121542A
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US1918531A
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US1916907A
Cited
US2278432A
Cited
US2306212A
Cited
US2447278A
Cited
US3070936A
Cited
US3348365A
Cited
US3370404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |