US3131078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Laboratory For Electronics Inc
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Filing: 1962-06-07
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Granted: 1964-04-28
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Expires: 1982-06-07
Abstract
No abstract record available.
Inventors
- 👤 Harrison W Fuller
- 👤 Murray E Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE METHOD OF MANUFACTURING DATA PROCESSING APPARATUS COMPRISING THE STEPS OF VACUUM-DEPOSITING A FIRST THIN FILM OF HIGH COERCIVE FORCE FERROMAGNETIC MATERIAL ON A DIFFRACTION GRATING REPLICA SUPPORTED BY A SUBSTRATE, APPLYING A FIRST MAGNETIC FIELD DURING THE DEPOSITION OF SAID FIRST FERROMAGNETIC FILM TO PROVIDE THE LATTER WITH AN EASY DIRECTION OF MAGNETIZATION PARALLEL TO A FIRST AXIS, ABRADING THE HIGH SPOTS DEPOSITED TO PRODUCE TRUE DISCONTINUITIES IN SAID FIRST FERROMAGNETIC FILM, VACUUM-DEPOSITING AN INSULATION FILM ON TOP OF SAID FIRST FERRO-MAGNETIC FILM, VACUUM-DEPOSITING A SECOND THIN FILM OF LOW COERCIVE FORCE FERROMAGNETIC MATERIAL ON TOP OF SAID INSULATION FILM, AND APPLYING A SECOND MAGENTIC FIELD DURING THE DEPOSITION OF SAID SECOND FERROMAGENTIC FILM TO PROVIDE AN EASY DIRECTION OF MAGNETIZATION OF SAID SECOND FERROMAGNETIC FILM PARALLEL TO A SECOND AXIS.
Claim 2
Independent Claim
132 words
THE METHOD OF MANUFACTURING DATA PROCESSING APPARATUS COMPRISING THE STEPS OF VACUUM-DEPOSITING A FIRST THIN FILM OF HIGH COERCIVE FORCE FERROMAGNETIC MATERIAL ON A DIFFRACTION GRATING REPLICA SUPPORTED BY A SUBSTRATE, APPLYING A FIRST MAGNETIC FIELD DURING THE DEPOSITION OF SAID FIRST FERROMAGNETIC FILM TO PROVIDE THE LATTER WITH AN EASY DIRECTION OF MAGNETIZATION PARALLEL TO A FIRST AXIS, ABRADING THE HIGH SPOTS DEPOSITED TO PRODUCE TRUE DISCONTINUITIES IN SAID FIRST FERROMAGNETIC FILM, VACUUM-DEPOSITING AN INSULATION FILM ON TOP OF SAID FIRST FERRO-MAGNETIC FILM, VACUUM-DEPOSITING A SECOND THIN FILM OF LOW COERCIVE FORCE FERROMAGNETIC MATERIAL ON TOP OF SAID INSULATION FILM, AND APPLYING A SECOND MAGENTIC FIELD DURING THE DEPOSITION OF SAID SECOND FERROMAGENTIC FILM TO PROVIDE AN EASY DIRECTION OF MAGNETIZATION OF SAID SECOND FERROMAGNETIC FILM PARALLEL TO A SECOND AXIS.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |