US3423069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1967-09-29
•
Granted: 1969-01-21
•
Expires: 1987-09-29
Abstract
No abstract record available.
Inventors
- 👤 George D Chandley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:54
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/186; F01D5/187; F01D5/28; F05; F05D; F05D2260/00; F05D2260/95
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2780435A
Cited
FR1151368A
Cited
GB846583A
Cited
US3246469A
Cited
US3301526A
Cited
US3315941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |