US2837452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making anisotropic permanent magnets
Assignee: US Philips Corp
•
Filing: 1956-01-18
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Granted: 1958-06-03
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Expires: 1976-01-18
Abstract
No abstract record available.
Inventors
- 👤 Vos Krijn Jacobus De
- 👤 Koch Adolf Johannus Jacobus
- 👤 Hendrik Johannes Meerka Embden
- 👤 Flipse Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:57
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C22; C22C; C22C38/00; C22C38/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN THE MANUFACTURE OF A PERMANENT MAGNET, THE STEPS OF FORMING A BODY OF A FERROUS ALLOY CONTAINING ABOUT 15 TO 42% COBALT, ABOUT 10 TO 20% NICKEL, ABOUT 6 TO 10% ALUMINUM, ABOUT 2 TO 8% COPPER, ABOUT 4 TO 10% TITANIUM AND THE BALANCE PRINCIPALLY IRON, QUENCHING SAID BODY FROM A TEMPERATURE EXCEEDING ABOUT 1200*C. TO A TEMPERATURE OF ABOUT 900*C., AND SUBJECTING SAID BODY TO THE ACTION OF A MAGNETIC FIELD WHILE SAID BODY IS MAINTAINED AT A SUBSTANTIALLY CONSTANT TEMPERATURE VARYING LESS THAN ABOUT 20*C. IN RANGE OF ABOUT 10* TO 70* C. BELOW ITS CURIE TEMPERATURE FOR ABOUT 2 TO 30 MINUTES WHEREBY AN ANISOTROPIC PERMANENT MAGNET HAVING A SUBSTANTIALLY INCREASED (BH)MAX IS OBTAINED.
Claim 2
Dependent Claim
119 words
IN THE MANUFACTURE OF A PERMANENT MAGNET, THE STEPS OF FORMING A BODY OF A FERROUS ALLOY CONTAINING ABOUT 15 TO 42% COBALT, ABOUT 10 TO 20% NICKEL, ABOUT 6 TO 10% ALUMINUM, ABOUT 2 TO 8% COPPER, ABOUT 4 TO 10% TITANIUM AND THE BALANCE PRINCIPALLY IRON, QUENCHING SAID BODY FROM A TEMPERATURE EXCEEDING ABOUT 1200*C. TO A TEMPERATURE OF ABOUT 900*C., AND SUBJECTING SAID BODY TO THE ACTION OF A MAGNETIC FIELD WHILE SAID BODY IS MAINTAINED AT A SUBSTANTIALLY CONSTANT TEMPERATURE VARYING LESS THAN ABOUT 20*C. IN RANGE OF ABOUT 10* TO 70* C. BELOW ITS CURIE TEMPERATURE FOR ABOUT 2 TO 30 MINUTES WHEREBY AN ANISOTROPIC PERMANENT MAGNET HAVING A SUBSTANTIALLY INCREASED (BH)MAX IS OBTAINED.
References Cited (Backward Citations)
US2499860A
Cited
US2578407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |