US2639119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade attachment means and method
Assignee: Lockheed Martin Corp
•
Filing: 1947-11-14
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Granted: 1953-05-19
•
Expires: 1967-11-14
Abstract
No abstract record available.
Inventors
- 👤 Harold A Greenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:47
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3061; F01D5/3023; F01D5/303; F01D5/3038; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321; Y10T29/49826; Y10T29/49908; Y10T29/49936; Y10T29/49938
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |