Patent US2900282A successfully refreshed from Google Patents.
US2900282A
Expired / Lapsed
US
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Method of treating magnetic material and resulting articles
Assignee: Unisys Corp
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Filing: 1956-07-20
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Granted: 1959-08-18
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Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Sidney M Rubens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/54; C23C14/541; C23C14/24; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F41/00; H01F41/14; H01F41/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
IN A METHOD FOR THE VACUUM DEPOSITION OF A METALLIC FILM ONTO A DI-ELECTRIC SUBSTRATE, THE IMPROVEMENT WHICH COMPRISES PREHEATING SAID SUBSTRATE TO AN ELEVATED TEMPERATURE BELOW THE MELTING POINT THEREOF, APPLYING A MAGNETIC FIELD ACROSS AT LEAST ONE SURFACE OF SAID SUBSTRATE IN A DIRECTION PARALLEL THERETO WHILE VAPORIZING IN SAID VACUUM AN ALLOY HAVING ABOUT 83% NICKEL AND THE REMAINDER IRON, AND MAINTAINING THE TEMPERATURE OF SAID SUBSTRATE IN THE COURSE OF SAID VAPORIZING IN THE RANGE OF FROM ABOUT 300* TO 400* C. UNTIL A THIN BISTABLE MAGNETIC FILM HAVING A THICKNESS UP TO 5000 ANGSTROM UNITS AND A COERCIVITY UP TO 10 PERSTEDS IS DEPOSITED ON SAID SURFACE OF THE SUBSTRATE, THE METHOD BEING SUCH THAT SAID MAGNETIC FILM HAS A PREFERRED DIRECTIOON OF MAGNETIZATION IN A DIRECTION PARALLOEL TO THE DIRECTION OF SAID MAGNETIC FIELD AND EXHIBITS SUBSTANTIALLY NO MAGNETOSTRICTION IN SAID PREFERRED DIRECTION BUT HAS SINGLE DOMAIN PROPERTIES.
Claim 2
Dependent Claim
154 words
IN A METHOD FOR THE VACUUM DEPOSITION OF A METALLIC FILM ONTO A DI-ELECTRIC SUBSTRATE, THE IMPROVEMENT WHICH COMPRISES PREHEATING SAID SUBSTRATE TO AN ELEVATED TEMPERATURE BELOW THE MELTING POINT THEREOF, APPLYING A MAGNETIC FIELD ACROSS AT LEAST ONE SURFACE OF SAID SUBSTRATE IN A DIRECTION PARALLEL THERETO WHILE VAPORIZING IN SAID VACUUM AN ALLOY HAVING ABOUT 83% NICKEL AND THE REMAINDER IRON, AND MAINTAINING THE TEMPERATURE OF SAID SUBSTRATE IN THE COURSE OF SAID VAPORIZING IN THE RANGE OF FROM ABOUT 300* TO 400* C. UNTIL A THIN BISTABLE MAGNETIC FILM HAVING A THICKNESS UP TO 5000 ANGSTROM UNITS AND A COERCIVITY UP TO 10 PERSTEDS IS DEPOSITED ON SAID SURFACE OF THE SUBSTRATE, THE METHOD BEING SUCH THAT SAID MAGNETIC FILM HAS A PREFERRED DIRECTIOON OF MAGNETIZATION IN A DIRECTION PARALLOEL TO THE DIRECTION OF SAID MAGNETIC FIELD AND EXHIBITS SUBSTANTIALLY NO MAGNETOSTRICTION IN SAID PREFERRED DIRECTION BUT HAS SINGLE DOMAIN PROPERTIES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |