Patent US2643839A successfully refreshed from Google Patents.
US2643839A
Expired / Lapsed
US
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Assignee: PALNUT Co
•
Filing: 1948-07-29
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Granted: 1953-06-30
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Expires: 1968-07-29
Abstract
No abstract record available.
Inventors
- 👤 Sislik Ivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:41
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/041; Y; Y10; Y10S; Y10S411/00; Y10S411/913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2386732A
Cited
US2404236A
Cited
US2503219A
Cited
US2468333A
Cited
US2496866A
Cited
US2455891A
Cited
US2539172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |