Patent US1790906A successfully refreshed from Google Patents.
US1790906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer
Assignee: —
•
Filing: —
•
Granted: 1931-02-03
•
Expires: 1948-02-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/025
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) | 1934-02-02 | 1934-08-04 | 1935-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-02-02 | 1938-08-04 | 1939-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-02-02 | 1942-08-04 | 1943-02-03 | $7700.00 | Window Closed / Lapsed |