US2452449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal trainer
Assignee: Individual
•
Filing: 1945-03-19
•
Granted: 1948-10-26
•
Expires: 1965-03-19
Abstract
No abstract record available.
Inventors
- 👤 Ralph K Forsyth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:21
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/0007; G08; G08B; G08B5/00; G08B5/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US629573A
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US757389A
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US1127051A
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US1280930A
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US1495953A
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US1492932A
Cited
US1506156A
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US1627211A
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US1826469A
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US2336927A
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US2376278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |