Patent US2987878A successfully refreshed from Google Patents.
US2987878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable geometry intake duct
Assignee: North American Aviation Corp
•
Filing: 1957-05-22
•
Granted: 1961-06-13
•
Expires: 1977-05-22
Abstract
No abstract record available.
Inventors
- 👤 Robert C Bogert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:19
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB593022A
Cited
US2551470A
Cited
US2625008A
Cited
US2763426A
Cited
US2772620A
Cited
US2840322A
Cited
US2788635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |