Patent US2524847A successfully refreshed from Google Patents.
US2524847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Herald trainer
Assignee: Individual
•
Filing: 1944-11-20
•
Granted: 1950-10-10
•
Expires: 1964-11-20
Abstract
No abstract record available.
Inventors
- 👤 Earl W Springer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:34
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/56; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US360844A
Cited
US1848882A
Cited
US1834405A
Cited
US1907105A
Cited
US2007220A
Cited
US2369622A
Cited
US2287429A
Cited
US2312962A
Cited
US2326880A
Cited
US2326766A
Cited
US2405591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |