Patent US5018517A successfully refreshed from Google Patents.
US2650340A
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US
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Arrangement for converting direct voltages into alternating voltages
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-04-29
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Granted: 1953-08-25
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Expires: 1969-04-29
Abstract
No abstract record available.
Inventors
- 👤 Posthumus Klaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:14
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/447; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1993581A
Cited
US2005458A
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US2024173A
Cited
US2147474A
Cited
US2338118A
Cited
US2475621A
Cited
US2486703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |