Patent DE530198C successfully refreshed from Google Patents.
Patent US2972804A successfully refreshed from Google Patents.
US2972804A
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Method of making stepped-lap core for inductive apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1955-12-29
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Granted: 1961-02-28
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Expires: 1975-12-29
Abstract
No abstract record available.
Inventors
- 👤 Belvin B Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:01
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0233; H01F41/024; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB106986A
Cited
US1992822A
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US2290680A
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US2548624A
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GB624137A
Cited
US2548628A
Cited
US2588173A
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US2657456A
Cited
US2603691A
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US2614158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |