US3465504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier device
Assignee: VIOLET E OROPEZA
•
Filing: 1967-10-26
•
Granted: 1969-09-09
•
Expires: 1987-10-26
Abstract
No abstract record available.
Inventors
- 👤 Esther Oropeza
- 👤 Violet E Oropeza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:23
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1985910A
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US2083468A
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US2484277A
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US2998097A
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US3180071A
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US3063686A
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US3212232A
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US3237777A
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US3246452A
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US3353337A
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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) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |