US2999668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-balanced rotor blade
Assignee: Curtiss Wright Corp
•
Filing: 1958-08-28
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Granted: 1961-09-12
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Expires: 1978-08-28
Abstract
No abstract record available.
Inventors
- 👤 Werner E Howald
- 👤 Hollerith Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:58
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/26; F01D5/02; F01D5/08; F01D5/081; F01D5/14; F01D5/18; F01D5/187; F01D5/30; F01D5/3053; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191322148A
Cited
GB189131A
Cited
FR844774A
Cited
US2326145A
Cited
FR969413A
Cited
GB666259A
Cited
GB667979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |