Patent US5417709A successfully refreshed from Google Patents.
US742886A
Expired / Lapsed
US
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Charging system for secondary batteries.
Assignee: Westinghouse Electric Corp
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Filing: 1903-03-12
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Granted: 1903-11-03
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Expires: 1923-03-12
Abstract
No abstract record available.
Inventors
- 👤 Hiram Percy Maxim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1087; B60; B60L; B60L50/00; B60L50/10; B60L50/16
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) | 1906-11-02 | 1907-05-04 | 1907-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-11-02 | 1911-05-04 | 1911-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-11-02 | 1915-05-04 | 1915-11-03 | $7700.00 | Window Closed / Lapsed |