Patent US2784391A successfully refreshed from Google Patents.
US2444385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating electric current rectifier
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1946-01-24
•
Granted: 1948-06-29
•
Expires: 1966-01-24
Abstract
No abstract record available.
Inventors
- 👤 Thompson Leslie Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:41
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D99/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2246161A
Cited
US2345122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |