US2541935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charging apparatus
Assignee: AT&T Inc
•
Filing: 1948-08-28
•
Granted: 1951-02-13
•
Expires: 1968-08-28
Abstract
No abstract record available.
Inventors
- 👤 James A Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:02
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/92; H02J7/02; H02J7/04; Y; Y10; Y10S; Y10S320/00; Y10S320/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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DE471766C
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US1928812A
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US1893223A
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US1961024A
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US2248821A
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US2300296A
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US2307576A
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US2377370A
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US2420577A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |