US2828264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture process of permanent magnets from sintered mixtures of oxides
Assignee: Audax Industries SA
•
Filing: 1955-09-12
•
Granted: 1958-03-25
•
Expires: 1975-09-12
Abstract
No abstract record available.
Inventors
- 👤 Medvedieff Serge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR PREPARING AN ANISOTROPIC PERMANENTLY MAGNETIC BARIUM CHROMIUM FERRITE HAVING A DENSITY OF AT LEAST ABOUT 4.45 COMPRISING MIXING FE2O3 WITH A MEMBER OF THE GROUP CONSISTING OF BACRO4, THE MOLECULAR PROPORATION OF IRON TO CHROMIUM BEING BETWEEN LECULAR PROPOTION OF IRON TO CHROMIUM BEING BETWEEN 4 AND 20, PRESSING SAID MIXTURE TO A TEMPERATURE OF BETWEEN ABOUT 900*C. AND ABOUT 1400*C. AND SUBJECTING SAID PASSING MIXTURE TO A STEADY MAGNETIC FIELD TO PROVIDE A SHAPED PERMANENT MAGNET HAVING A RESIDUAL INDUCTION NETIZATION OF AT LEAST ABOUT 3200 OERSTEDS.
Claim 2
Dependent Claim
91 words
A PROCESS FOR PREPARING AN ANISOTROPIC PERMANENTLY MAGNETIC BARIUM CHROMIUM FERRITE HAVING A DENSITY OF AT LEAST ABOUT 4.45 COMPRISING MIXING FE2O3 WITH A MEMBER OF THE GROUP CONSISTING OF BACRO4, THE MOLECULAR PROPORATION OF IRON TO CHROMIUM BEING BETWEEN LECULAR PROPOTION OF IRON TO CHROMIUM BEING BETWEEN 4 AND 20, PRESSING SAID MIXTURE TO A TEMPERATURE OF BETWEEN ABOUT 900*C. AND ABOUT 1400*C. AND SUBJECTING SAID PASSING MIXTURE TO A STEADY MAGNETIC FIELD TO PROVIDE A SHAPED PERMANENT MAGNET HAVING A RESIDUAL INDUCTION NETIZATION OF AT LEAST ABOUT 3200 OERSTEDS.
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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |