Patent US2931493A successfully refreshed from Google Patents.
Patent US2442297A successfully refreshed from Google Patents.
US2442297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Training device
Assignee: Individual
•
Filing: 1939-01-14
•
Granted: 1948-05-25
•
Expires: 1959-01-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin A Link
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:59
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE218891C
Cited
US830718A
Cited
US1109665A
Cited
US1019405A
Cited
US1293747A
Cited
US1393456A
Cited
US1402498A
Cited
US1596936A
Cited
US1701582A
Cited
US1770820A
Cited
US1799895A
Cited
US1831939A
Cited
GB384971A
Cited
US1938595A
Cited
FR747274A
Cited
US1985265A
Cited
US1985266A
Cited
US2163746A
Cited
US2119083A
Cited
US2034298A
Cited
US2091154A
Cited
US2164412A
Cited
US2099857A
Cited
US2179663A
Cited
US2364539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-25 | 1951-11-24 | 1952-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-25 | 1955-11-24 | 1956-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-25 | 1959-11-24 | 1960-05-25 | $7700.00 | Window Closed / Lapsed |