US3047423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isotropic thin magnetic film
Assignee: International Business Machines Corp
•
Filing: 1958-12-17
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Granted: 1962-07-31
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Expires: 1978-12-17
Abstract
No abstract record available.
Inventors
- 👤 John S Eggenberger
- 👤 John C Lloyd
- 👤 Robert S Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/24; H01F41/26; G; G11; G11C; G11C11/00; G11C11/56; G11C11/5607; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
A METHOD OF MAKING A THIN MAGNETIC FILM ELEMENT BY VACUUM EVAPORATION HAVING SUBSTANTIALLY ISOTROPIC MAGNETIC ORIENTATION COMPRISING THE , STEPS OF DEPOSITING A CONTINUOUS METALLIC FILM OF FERROMAGNETIC MATERIAL HAVING A THICKNESS OF APPROXIMATELY 2000 A. ON A NON-MAGNETIC AND ELECTRICALLY NON-CONDUCTIVE SUBSTRATE MEMBER IN THE PRESENCE OF AN EXTERNAL MAGNETIC FIELD APPLIED IN THE PLANE OF SAID FILM AND THEREAFTER ANNEALING SAID FILM AT ELEVATED TEMPERATURES OF 400* C.-800* C. FOR AN EXTENDED PERIOD OF AT LEAST THREE HOURS.
References Cited (Backward Citations)
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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) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |