US2197497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selenium rectifier and method of producing same
Assignee: Sueddeutsche Apparate Fabrik GmbH
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Filing: 1939-06-07
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Granted: 1940-04-16
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Expires: 1959-06-07
Abstract
No abstract record available.
Inventors
- 👤 Geisler Otmar
- 👤 Kipphan Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:13
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/043; H10D48/046; Y; Y10; Y10S; Y10S205/00; Y10S205/917
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) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |