US2765859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan
Assignee: HARTZELL PROPELLER FAN CO
•
Filing: 1954-09-15
•
Granted: 1956-10-09
•
Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 Robert N Hartzell
- 👤 Donald D Herrman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:31
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1433728A
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US1430561A
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US1638695A
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US2191341A
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US2202013A
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US2232670A
Cited
US2307490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |