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Patent US3273327A successfully refreshed from Google Patents.
US3273327A
Expired / Lapsed
US
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Plastic air filters
Assignee: Fedders Corp
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Filing: 1964-06-18
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Granted: 1966-09-20
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Expires: 1984-06-18
Abstract
No abstract record available.
Inventors
- 👤 Donald E Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:53
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; F; F24; F24F; F24F13/00; F24F13/28; Y; Y10; Y10S; Y10S264/00; Y10S264/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |