Patent US2156054A successfully refreshed from Google Patents.
US2156054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry rectifier
Assignee: Sueddeutsche Apparate Fabrik GmbH
•
Filing: 1937-07-24
•
Granted: 1939-04-25
•
Expires: 1957-07-24
Abstract
No abstract record available.
Inventors
- 👤 Geisler Ottmar
- 👤 Herrmann Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:07
CPC Classifications
H; H10; H10W; H10W72/00; 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)
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) | 1942-04-24 | 1942-10-24 | 1943-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-24 | 1946-10-24 | 1947-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-24 | 1950-10-24 | 1951-04-25 | $7700.00 | Window Closed / Lapsed |