US3428498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of sintered permanent alnico magnets
Assignee: Magnetfabrik Bonn GmbH
•
Filing: 1965-07-29
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Granted: 1969-02-18
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Expires: 1985-07-29
Abstract
No abstract record available.
Inventors
- 👤 Gunther Heimke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:53
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; H01F41/028; B; B22; B22F; B22F3/00; B22F9/00; B22F9/16; B22F9/30; C; C30; C30B; C30B29/00; C30B29/10; C30B29/52; C30B31/00; C30B31/02; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/086; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2188091A
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US2384215A
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US2694790A
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US2825670A
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US2849312A
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DE1045006B
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US3066355A
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US3387972A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |