Patent US786697A successfully refreshed from Google Patents.
US2292191A
Expired / Lapsed
US
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Ferromagnetic material
Assignee: Westinghouse Electric Corp
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Filing: 1940-08-02
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Granted: 1942-08-04
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Expires: 1960-08-02
Abstract
No abstract record available.
Inventors
- 👤 Weldon H Brandt
- 👤 Walter R Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:37
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-08-03 | 1946-02-02 | 1946-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-03 | 1950-02-02 | 1950-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-03 | 1954-02-02 | 1954-08-04 | $7700.00 | Window Closed / Lapsed |