Patent US2445673A successfully refreshed from Google Patents.
US2445673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic compass indicating system for aviation trainers
Assignee: Link Aviation Inc
•
Filing: 1943-07-30
•
Granted: 1948-07-20
•
Expires: 1963-07-30
Abstract
No abstract record available.
Inventors
- 👤 Karl A Kail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:07
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/24; G09B9/245
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1974220A
Cited
US1825462A
Cited
US1975442A
Cited
GB396538A
Cited
GB396537A
Cited
US2164412A
Cited
US2099857A
Cited
US2321799A
Cited
US2326764A
Cited
US2326766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |