US2780767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for converting a low voltage into a high direct voltage
Assignee: Hartford National Bank and Trust Co
•
Filing: 1955-04-07
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Granted: 1957-02-05
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Expires: 1975-04-07
Abstract
No abstract record available.
Inventors
- 👤 Janssen Peter Johanne Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:31
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1949383A
Cited
US2568485A
Cited
US2556286A
Cited
US2658176A
Cited
US2657360A
Cited
US2748274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |