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Patent US2489996A successfully refreshed from Google Patents.
US2489996A
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Direct current power supply system
Assignee: Askania Regulator Co
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Filing: 1947-08-15
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Granted: 1949-11-29
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Expires: 1967-08-15
Abstract
No abstract record available.
Inventors
- 👤 Ziebolz Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:22
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1874777A
Cited
US1844704A
Cited
US2000189A
Cited
US2208400A
Cited
US2212229A
Cited
US2261699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |