Patent US2920259A successfully refreshed from Google Patents.
US2920259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current converter
Assignee: US Philips Corp
•
Filing: 1956-11-28
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Granted: 1960-01-05
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Expires: 1976-11-28
Abstract
No abstract record available.
Inventors
- 👤 Light Leon Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:04
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)
US2757243A
Cited
US2783384A
Cited
US2791739A
Cited
US2780767A
Cited
US2748274A
Cited
US2774878A
Cited
US2782310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |