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US1447916A
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US
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Centrifugal fan
Assignee: AMERICAN BLOWER CO
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Filing: 1920-12-18
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Granted: 1923-03-06
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Expires: 1940-12-18
Abstract
No abstract record available.
Inventors
- 👤 James A Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:59
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1926-03-05 | 1926-09-04 | 1927-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-03-05 | 1930-09-04 | 1931-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-03-05 | 1934-09-04 | 1935-03-06 | $7700.00 | Window Closed / Lapsed |