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Patent US873923A successfully refreshed from Google Patents.
US873923A
Expired / Lapsed
US
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Centrifugal fan.
Assignee: Individual
•
Filing: 1907-03-13
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Granted: 1907-12-17
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Expires: 1927-03-13
Abstract
No abstract record available.
Inventors
- 👤 Louis Bertram Cousans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
F; F04; F04D; F04D3/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913
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) | 1910-12-16 | 1911-06-17 | 1911-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-12-16 | 1915-06-17 | 1915-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-12-16 | 1919-06-17 | 1919-12-17 | $7700.00 | Window Closed / Lapsed |