US2593241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulator for battery charging system
Assignee: Duracell Inc USA
•
Filing: 1948-11-17
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Granted: 1952-04-15
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Expires: 1968-11-17
Abstract
No abstract record available.
Inventors
- 👤 Robert J Aust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1968971A
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US1833349A
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US2028734A
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US2209051A
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US2469092A
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US2435063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |