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US43663A
Expired / Lapsed
US
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Improvement in windmills
Assignee: —
•
Filing: —
•
Granted: 1864-08-02
•
Expires: 1881-08-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:54
CPC Classifications
F; F03; F03D; F03D7/00; F03D7/06; F03B; F03B3/00; F03B3/12; F03B3/14; F03B3/145; F03D80/00; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y02E10/70; Y02E10/72; Y02E10/74; Y10; Y10S; Y10S415/00; Y10S415/905; Y10S415/907
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) | 1867-08-02 | 1868-02-01 | 1868-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1871-08-02 | 1872-02-01 | 1872-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1875-08-02 | 1876-02-01 | 1876-08-02 | $7700.00 | Window Closed / Lapsed |