US2671528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Individual
•
Filing: 1944-01-25
•
Granted: 1954-03-09
•
Expires: 1964-01-25
Abstract
No abstract record available.
Inventors
- 👤 William E Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:39
CPC Classifications
A; A62; A62B; A62B23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1395833A
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US1499864A
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US1743675A
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US1866659A
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US1789262A
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US1889015A
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GB365478A
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US1963874A
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US2225990A
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GB510985A
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US2400719A
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US2273779A
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US2302807A
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US2283043A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |