US3189667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing pressings to form permanent magnets
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1961-11-15
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Granted: 1965-06-15
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Expires: 1981-11-15
Abstract
No abstract record available.
Inventors
- 👤 Buttner Karl-Heinz
- 👤 Voller Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:25
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; Y; Y10; Y10S; Y10S425/00; Y10S425/033; Y10S428/00; Y10S428/90; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF PRODUCING PRESSINGS TO FORM PERMANENT MAGNETS FROM FERROMAGNETIC POWDERS OF SUCH FINENESS AS TO BE NON-FLOWABLE WHICH COMPRISES THE STEP OF TRAPPING THE POWDER AND MAGNETISING THE POWDER BY THE BRIEF APPLICATION OF A FIELD THERETO WHILE SO TRAPPED SO THAT THE PARTICLES CLING LIGHTLY TOGETHER AND THEREAFTER RELEASING THE MAGNETISED POWDER TO FLOW SOLELY BY GRAVITY INTO THE CAVITY OF A DIE AND PRESSING IT.
Claim 2
Independent Claim
69 words
A METHOD OF PRODUCING PRESSINGS TO FORM PERMANENT MAGNETS FROM FERROMAGNETIC POWDERS OF SUCH FINENESS AS TO BE NON-FLOWABLE WHICH COMPRISES THE STEP OF TRAPPING THE POWDER AND MAGNETISING THE POWDER BY THE BRIEF APPLICATION OF A FIELD THERETO WHILE SO TRAPPED SO THAT THE PARTICLES CLING LIGHTLY TOGETHER AND THEREAFTER RELEASING THE MAGNETISED POWDER TO FLOW SOLELY BY GRAVITY INTO THE CAVITY OF A DIE AND PRESSING IT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |