US2461087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating electric current rectifier of the dry surface contact type
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1945-12-21
•
Granted: 1949-02-08
•
Expires: 1965-12-21
Abstract
No abstract record available.
Inventors
- 👤 Sell Richard Geoffrey
- 👤 Thompson Leslie Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
H; H10; H10W; H10W90/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE548391C
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US1728537A
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CH163675A
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DE593239C
Cited
US2126765A
Cited
US2117020A
Cited
US2343379A
Cited
US2383735A
Cited
US2406806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-08 | 1952-08-09 | 1953-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-08 | 1956-08-09 | 1957-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-08 | 1960-08-09 | 1961-02-08 | $7700.00 | Window Closed / Lapsed |