Patent US2641404A successfully refreshed from Google Patents.
US2641404A
Expired / Lapsed
US
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Blower-filter unit
Assignee: Air Controls Inc
•
Filing: 1950-03-18
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Granted: 1953-06-09
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Expires: 1970-03-18
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:38
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1605806A
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US2116539A
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US1669459A
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US1779201A
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US2048017A
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US2065970A
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US2163111A
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US2359571A
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US2373969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |