US2534178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of permanent magnets
Assignee: D'ELECTIRO-CHIMIE D'ELECTRO-METALLURGIE ET DES ACIERIES ELECTRIQUES D'UGINE Ste
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Filing: 1947-02-07
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Granted: 1950-12-12
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Expires: 1967-02-07
Abstract
No abstract record available.
Inventors
- 👤 Marquaire Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:57
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; B; B22; B22F; B22F1/00; B22F1/14; B22F1/142; C; C22; C22C; C22C33/00; C22C33/02; H01F41/0266; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN THE TREATMENT OF PERMANENT MAGNETS OBTAINED BY AGGLOMERATING METALIC POWDER, THE GRAINS OF WHICH ARE UNINSULATED AND HAVE DIMENSIONS OF THE ORDER OF THOSE OF COLLOIDAL PARTICLES, THE STEP CONSISTING IN HEATING SAID PERMANENT MAGNETS INA NON-OXIDIZING ATMOSPHERE WITHIN THE RANGE OF ABOUT 300* C.-480*C. AT SUCH TEMPERATURE AS INCREASES THE REMANENT INDUCTION, DECREASES THE COERCIVE FORCE AND AT LEAST MAINTAINS THE PRODUCT OF BOTH SAID FACTORS.
Claim 2
Dependent Claim
68 words
IN THE TREATMENT OF PERMANENT MAGNETS OBTAINED BY AGGLOMERATING METALIC POWDER, THE GRAINS OF WHICH ARE UNINSULATED AND HAVE DIMENSIONS OF THE ORDER OF THOSE OF COLLOIDAL PARTICLES, THE STEP CONSISTING IN HEATING SAID PERMANENT MAGNETS INA NON-OXIDIZING ATMOSPHERE WITHIN THE RANGE OF ABOUT 300* C.-480*C. AT SUCH TEMPERATURE AS INCREASES THE REMANENT INDUCTION, DECREASES THE COERCIVE FORCE AND AT LEAST MAINTAINS THE PRODUCT OF BOTH SAID FACTORS.
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |