US1390504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformation of polyphase currents into practically constant direct currents
Assignee: Individual
•
Filing: 1918-01-07
•
Granted: 1921-09-13
•
Expires: 1938-01-07
Abstract
No abstract record available.
Inventors
- 👤 Corbino Orso Mario
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:41
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/30
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) | 1924-09-12 | 1925-03-14 | 1925-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-09-12 | 1929-03-14 | 1929-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-09-12 | 1933-03-14 | 1933-09-13 | $7700.00 | Window Closed / Lapsed |