Patent US1358810A successfully refreshed from Google Patents.
US1358810A
Expired / Lapsed
US
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Process of treating magnetizable material
Assignee: Westinghouse Electric Corp
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Filing: 1919-04-04
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Granted: 1920-11-16
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Expires: 1939-04-04
Abstract
No abstract record available.
Inventors
- 👤 Trygve D Yensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:49
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1255; C21D3/00; C21D3/02; C21D3/04
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) | 1923-11-16 | 1924-05-17 | 1924-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-11-16 | 1928-05-17 | 1928-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-11-16 | 1932-05-17 | 1932-11-16 | $7700.00 | Window Closed / Lapsed |