Patent US2839840A successfully refreshed from Google Patents.
US2839840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Night landing simulator for training aircraft operators
Assignee: Link Aviation Inc
•
Filing: 1955-04-14
•
Granted: 1958-06-24
•
Expires: 1975-04-14
Abstract
No abstract record available.
Inventors
- 👤 Harold S Hemstreet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:48
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/326
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2420316A
Cited
US1829634A
Cited
US1916567A
Cited
US2352101A
Cited
US2385095A
Cited
US2381757A
Cited
GB622312A
Cited
GB640045A
Cited
US2518419A
Cited
US2711593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |