US2903329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for molding anisotropic permanent magnets
Assignee: US Philips Corp
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Filing: 1954-04-13
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Granted: 1959-09-08
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Expires: 1974-04-13
Abstract
No abstract record available.
Inventors
- 👤 Weber Gerard Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683; H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; H01F41/028; Y; Y10; Y10S; Y10S264/00; Y10S264/58; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A MOLD FOR MAKING A CIRCULAR ANISOTROPIC PERMANENT MAGNET, COMPRISING A HOLLOW CYLINDRICAL BODY OF FERROMAGNETIC MATERIAL HAVING POLES OF ALTERNATE POLASRITY DISPOSED AROUND THE INNER SURFACE THEREFORE AND BEING CONSTITUTED OF PORTIONS THAT ARE MAGNETICALLY ANISOTROPIC, SAID MATERIAL CONSISTING SUBSTANTIALLY OF CRYSTALS HAVING DIMEMSIONS NOT EXCEEDING 10 MICRONS AND HAVING A COMPOSITION SELECTED FROM THE GROUP CONSISTING OF MO.6FE2O3 AND MFE18O27, M BEING A METAL SELECTED FROM THE GROUP CONSISTING OF BARIUM, STRONIUM, AND LEAD, SAID BODY HAVING A COERCIVE FORCE OF AT LEAST 1000 OERSTED AND A REMANENCE OF AT LEAST 1500 GAUSS, AND A NON-FERROMAGNETIC PUNCH XAIALLY MOVABLE WITHIN SAID FERROMAGNETIC BODY.
Claim 2
Dependent Claim
105 words
A MOLD FOR MAKING A CIRCULAR ANISOTROPIC PERMANENT MAGNET, COMPRISING A HOLLOW CYLINDRICAL BODY OF FERROMAGNETIC MATERIAL HAVING POLES OF ALTERNATE POLASRITY DISPOSED AROUND THE INNER SURFACE THEREFORE AND BEING CONSTITUTED OF PORTIONS THAT ARE MAGNETICALLY ANISOTROPIC, SAID MATERIAL CONSISTING SUBSTANTIALLY OF CRYSTALS HAVING DIMEMSIONS NOT EXCEEDING 10 MICRONS AND HAVING A COMPOSITION SELECTED FROM THE GROUP CONSISTING OF MO.6FE2O3 AND MFE18O27, M BEING A METAL SELECTED FROM THE GROUP CONSISTING OF BARIUM, STRONIUM, AND LEAD, SAID BODY HAVING A COERCIVE FORCE OF AT LEAST 1000 OERSTED AND A REMANENCE OF AT LEAST 1500 GAUSS, AND A NON-FERROMAGNETIC PUNCH XAIALLY MOVABLE WITHIN SAID FERROMAGNETIC BODY.
References Cited (Backward Citations)
US1997193A
Cited
US1991143A
Cited
GB523970A
Cited
US2576679A
Cited
US2619674A
Cited
FR1020742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |