US2854412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a permanent magnet
Assignee: US Philips Corp
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Filing: 1954-12-23
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Granted: 1958-09-30
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Expires: 1974-12-23
Abstract
No abstract record available.
Inventors
- 👤 Frank G Brockman
- 👤 Jr Walter G Steneck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF MANUFACTURING A PERMANENT MAGNET COMPRISING ESSENTIALLY THE STEPS, FORMING A MIXTURE OF FE2O3 AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF BAO AND SRO IN A MOLE RATIO OF ABOUT 6:1.0 TO 1.2, HEATING SAID MIXTURE AT A TEMPERATURE OF ABOUT 1000*C. FOR ABOUT 4 HOURS, GRINDING THE RESULTING PRODUCT, COMPACTING THE RESULTANT GROUND PRODUCT UNDER PRESSURE OF FROM ABOUT 6000 LBS./IN.2 TO 17,000 LBS./IN.2 TO FORM A MOLDED BODY, HEATING SAID MOLDED BODY FROM ROOM TEMPERATURE TO A SINTERING TEMPERATURE OF ABOUT 1250*C. TO 1270*C. AT A RATE ABOUT 72*C. PER MINUTE, MAINTAINING SAID MOLDED BODY AT SAID SINTERING TEMPERATURE FOR A PERIOD OF TIME OF LESS THAN ONE MINUTE AND COOLING SAID BODY.
Claim 2
Independent Claim
121 words
THE METHOD OF MANUFACTURING A PERMANENT MAGNET COMPRISING ESSENTIALLY THE STEPS, FORMING A MIXTURE OF FE2O3 AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF BAO AND SRO IN A MOLE RATIO OF ABOUT 6:1.0 TO 1.2, HEATING SAID MIXTURE AT A TEMPERATURE OF ABOUT 1000*C. FOR ABOUT 4 HOURS, GRINDING THE RESULTING PRODUCT, COMPACTING THE RESULTANT GROUND PRODUCT UNDER PRESSURE OF FROM ABOUT 6000 LBS./IN.2 TO 17,000 LBS./IN.2 TO FORM A MOLDED BODY, HEATING SAID MOLDED BODY FROM ROOM TEMPERATURE TO A SINTERING TEMPERATURE OF ABOUT 1250*C. TO 1270*C. AT A RATE ABOUT 72*C. PER MINUTE, MAINTAINING SAID MOLDED BODY AT SAID SINTERING TEMPERATURE FOR A PERIOD OF TIME OF LESS THAN ONE MINUTE AND COOLING SAID BODY.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |