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US3444012A
Expired / Lapsed
US
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Process for treating platinum-iron permanent magnet alloys for improving their magnetic performance
Assignee: Citizen Holdings Co Ltd
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Filing: 1965-06-22
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Granted: 1969-05-13
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Expires: 1985-06-22
Abstract
No abstract record available.
Inventors
- 👤 Shotaro Shimizu
- 👤 Kuniyoshi Watai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:01
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C5/00; C22C5/04; C22F; C22F1/00; C22F1/14; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1669649A
Cited
US2192744A
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US2289570A
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US2617723A
Cited
US2622050A
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US3206337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |