US2969127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Individual
•
Filing: 1957-09-30
•
Granted: 1961-01-24
•
Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Richard R Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:49
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; F; F24; F24F; F24F8/00; F24F8/10; F24F8/108; F24F8/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1848576A
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US1231289A
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AT90856B
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US1450951A
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FR737519A
Cited
US1898424A
Cited
US2077951A
Cited
US2450191A
Cited
US2486520A
Cited
US2660270A
Cited
US2729302A
Cited
US2778443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |