US2243448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Hitachi Rail STS USA Inc
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Filing: 1939-04-27
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Granted: 1941-05-27
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Expires: 1959-04-27
Abstract
No abstract record available.
Inventors
- 👤 Wesley B Wells
- 👤 William K Lockhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:04
CPC Classifications
F; F21; F21S; F21S8/00; F21W; F21W2111/00; F21W2111/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-05-26 | 1944-11-25 | 1945-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-05-26 | 1948-11-25 | 1949-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-05-26 | 1952-11-25 | 1953-05-27 | $7700.00 | Window Closed / Lapsed |