US2189909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier system
Assignee: SUDDEUTSCHE APP FABRIK
•
Filing: 1938-09-01
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Granted: 1940-02-13
•
Expires: 1958-09-01
Abstract
No abstract record available.
Inventors
- 👤 Korber Emil
- 👤 Schaller Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/40; H10W40/43
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) | 1943-02-12 | 1943-08-14 | 1944-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-12 | 1947-08-14 | 1948-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-12 | 1951-08-14 | 1952-02-13 | $7700.00 | Window Closed / Lapsed |