Patent US1908800A successfully refreshed from Google Patents.
US1908800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical rectifier
Assignee: Hitachi Rail STS USA Inc
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Filing: 1932-07-13
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Granted: 1933-05-16
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Expires: 1952-07-13
Abstract
No abstract record available.
Inventors
- 👤 Utne Per
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:26
CPC Classifications
H; H10; H10W; H10W90/00; H10D; H10D99/00
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) | 1936-05-15 | 1936-11-14 | 1937-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-05-15 | 1940-11-14 | 1941-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-05-15 | 1944-11-14 | 1945-05-16 | $7700.00 | Window Closed / Lapsed |