US2762777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet and method of making the same
Assignee: Hartford National Bank and Trust Co
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Filing: 1951-07-30
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Granted: 1956-09-11
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Expires: 1971-07-30
Abstract
No abstract record available.
Inventors
- 👤 Went Jan Jacobus
- 👤 Gerard Willem Van Oosterhout
- 👤 Gorter Everet Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD OF MAKING A PERMANENT MAGNET HAVING AN INTRINSIC COERCIVE FORCE (IHC) OF AT LEAST 700 OERSTED AND A REMANENCE (BR) OF AT LEAST 1200 GAUSS COMPRISING, THE STEPS OF COMPACTING INTO A BODY OF A DESIRED SHAPE, FINELY-DIVIDED MATERIAL HAVING A COMPOSITION SELECTED FROM THE GROUP CONSISTING OF MFE12O19 AND MFE18O27 IN WHICH M IS A METAL SELECTED FROM THE GROUP CONSISTING OF BA, SR AND PB, SAID MATERIAL BEING OBTAINED BY HEATING A MIXTURE OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF BARIUM, STRONTIUM AND LEAD OXIDES AND FE2O3 IN A MOL RATIO OF BETWEEN ABOUT 1:2 AND 1:10 AT A TEMPERATURE BETWEEN ABOUT 900* C. AND 1100* C.; HEATING SAID COMPACTED BODY TO A TEMPERATURE BETWEEN ABOUT 900* C. AND 1450* C. TO SINTER THE SAME INTO A HIGHLYCOHERENT BODY; AND MAGNETIZING SAID LATTER BODY.
Claim 2
Independent Claim
140 words
A METHOD OF MAKING A PERMANENT MAGNET HAVING AN INTRINSIC COERCIVE FORCE (IHC) OF AT LEAST 700 OERSTED AND A REMANENCE (BR) OF AT LEAST 1200 GAUSS COMPRISING, THE STEPS OF COMPACTING INTO A BODY OF A DESIRED SHAPE, FINELY-DIVIDED MATERIAL HAVING A COMPOSITION SELECTED FROM THE GROUP CONSISTING OF MFE12O19 AND MFE18O27 IN WHICH M IS A METAL SELECTED FROM THE GROUP CONSISTING OF BA, SR AND PB, SAID MATERIAL BEING OBTAINED BY HEATING A MIXTURE OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF BARIUM, STRONTIUM AND LEAD OXIDES AND FE2O3 IN A MOL RATIO OF BETWEEN ABOUT 1:2 AND 1:10 AT A TEMPERATURE BETWEEN ABOUT 900* C. AND 1100* C.; HEATING SAID COMPACTED BODY TO A TEMPERATURE BETWEEN ABOUT 900* C. AND 1450* C. TO SINTER THE SAME INTO A HIGHLYCOHERENT BODY; AND MAGNETIZING SAID LATTER BODY.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |