Patent US2827437A successfully refreshed from Google Patents.
US2827437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a permanent magnet
Assignee: US Philips Corp
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Filing: 1952-10-01
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Granted: 1958-03-18
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Expires: 1972-10-01
Abstract
No abstract record available.
Inventors
- 👤 Rathenau Gerhart Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:10
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/003; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0311; H01F1/0313; H01F1/0315; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD OF MAGNETIZING A PERMANENT MAGNET BODY CONSISTING ESSENTIALLY OF A HIGHLY-COHERENT COMPACT MASS OF HEXAGONAL CRYSTALS SELECTED FROM THE GROUP CONSISTING OF MFE12O19 AND MFE18O27 IN WHICH M IS AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF BARIUM, STRONTIUM, AND LEAD AND CALCIUM IN AN ATOMIC FRACTION UP TO 0.4 OF SAID METAL, COMPRISING THE STEPS, BRINGING SAID BODY TO A TEMPERATURE SUBSTANTIALLY DIFFERENT THAN ROOM TEMPERATURE BUT BELOW THE CURIE POINT OF SAID BODY, SUBJECTING SAID BODY WHILE AT SAID TEMPERATURE TO A MAGNETIZING FIELD HAVING AN INTENSITY LESS THAN ABOUT 700 OERSTED, AND BRINGING SAID MAGNETICALLY SATURATED BODY TO ROOM TEMPERATURE WITHOUT FURTHER MAGNETIZING SAID BODY.
Claim 2
Independent Claim
112 words
A METHOD OF MAGNETIZING A PERMANENT MAGNET BODY CONSISTING ESSENTIALLY OF A HIGHLY-COHERENT COMPACT MASS OF HEXAGONAL CRYSTALS SELECTED FROM THE GROUP CONSISTING OF MFE12O19 AND MFE18O27 IN WHICH M IS AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF BARIUM, STRONTIUM, AND LEAD AND CALCIUM IN AN ATOMIC FRACTION UP TO 0.4 OF SAID METAL, COMPRISING THE STEPS, BRINGING SAID BODY TO A TEMPERATURE SUBSTANTIALLY DIFFERENT THAN ROOM TEMPERATURE BUT BELOW THE CURIE POINT OF SAID BODY, SUBJECTING SAID BODY WHILE AT SAID TEMPERATURE TO A MAGNETIZING FIELD HAVING AN INTENSITY LESS THAN ABOUT 700 OERSTED, AND BRINGING SAID MAGNETICALLY SATURATED BODY TO ROOM TEMPERATURE WITHOUT FURTHER MAGNETIZING 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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |