Patent US1797587A successfully refreshed from Google Patents.
US1797587A
Expired / Lapsed
US
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Current rectifying apparatus
Assignee: Hitachi Rail STS USA Inc
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Filing: 1927-03-29
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Granted: 1931-03-24
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Expires: 1947-03-29
Abstract
No abstract record available.
Inventors
- 👤 Peter Leslie Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/04; H; H10; H10D; H10D48/00; H10D48/01; H10D48/07
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) | 1934-03-23 | 1934-09-22 | 1935-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-03-23 | 1938-09-22 | 1939-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-03-23 | 1942-09-22 | 1943-03-24 | $7700.00 | Window Closed / Lapsed |