Patent US2568169A successfully refreshed from Google Patents.
US2568169A
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Stamped helical coil
Assignee: Zenith Electronics LLC
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Filing: 1949-05-11
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Granted: 1951-09-18
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Expires: 1969-05-11
Abstract
No abstract record available.
Inventors
- 👤 Raczynski Chester Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:58
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/045; H01C; H01C3/00; H01C3/10; H01F27/00; H01F27/28; H01F27/2847; Y; Y10; Y10T; Y10T29/00; Y10T29/18; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49609
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190804464A
Cited
US1971452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |