Patent US4390404A successfully refreshed from Google Patents.
US4390404A
Expired / Lapsed
US
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Process for manufacture of thin-film magnetic bubble domain detection device
Assignee: NEC Corp
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Filing: 1981-05-21
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Granted: 1983-06-28
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Expires: 2001-05-21
Abstract
Abstract A process for manufacturing a thin-film magnetic bubble domain detection device in which first a spacer and then a conductor film are deposited onto a substrate, and then the conductor film is removed from a predetermined region using a mask. Thereafter a magnetic field sensing film is deposited onto the substrate, with the mask still thereon, and then the mask is removed.
Inventors
- 👤 Sotaro Esho
- 👤 Hiroshi Gokan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:43
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866; H; H01; H01F; H01F10/00; H01F10/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
A process for manufacturing a thin-film magnetic bubble domain detection device comprising the steps of: depositing a spacer and then a conductor film onto a substrate, and removing said conductor film from a predetermined region using a mask; thereafter depositing a magnetic field sensing film onto said substrate over an area including said predetermined region without removing said mask, and then depositing a first dielectric film onto said substrate over a second area including sid predetermined region, followed by the removal of said magnetic field sensing film and said first dielectric film from the portions of said first and second areas other than said predetermined region by lifting off said first mask; delineating said conductor film for conductor leads, sid magnetic field sensing film for a sensing element, and said first dielectric film into a detection device configuration using a second mask; and depositing a second dielectric film without removing said second mask, and then removing said second dielectric film from said conductor film, said magnetic field sensing film and said first dielectric film by lifting off said second mask.
Claim 2
Dependent Claim
180 words
A process for manufacturing a thin-film magnetic bubble domain detection device comprising the steps of: depositing a spacer and then a conductor film onto a substrate, and removing said conductor film from a predetermined region using a mask; thereafter depositing a magnetic field sensing film onto said substrate over an area including said predetermined region without removing said mask, and then depositing a first dielectric film onto said substrate over a second area including sid predetermined region, followed by the removal of said magnetic field sensing film and said first dielectric film from the portions of said first and second areas other than said predetermined region by lifting off said first mask; delineating said conductor film for conductor leads, sid magnetic field sensing film for a sensing element, and said first dielectric film into a detection device configuration using a second mask; and depositing a second dielectric film without removing said second mask, and then removing said second dielectric film from said conductor film, said magnetic field sensing film and said first dielectric film by lifting off said second mask.
Claim 3
Dependent Claim
41 words
A process for manufacturing a thin-film magnetic bubble domain detection device according to claim 1 wherein the conductor film is removed from a predetermined region covering an area larger than that of a magnetic field sensing element of the detection device.
Claim 4
Dependent Claim
41 words
A process for manufacturing a thin-film magnetic bubble domain detection device according to claim 1 wherein the conductor film is removed from said predetermined region in a manner to form an acute angle with respect to the plane of the substrate.
Claim 5
Dependent Claim
31 words
A process for manufacturing a detection device as defined in claim 1, wherein a dry etching technique using ion milling is used for removing said conductor film from said predetermined region.
Claim 6
Dependent Claim
44 words
A process for manufacturing a detection device as defined in claim 1, wherein the etching of said conductor film in said conductor removing step and the depositing of said sensing film in said sensing film depositing step are performed in one continuous vacuum-pumping operation.
Claim 7
Dependent Claim
34 words
A process for manufacturing a thin-film magnetic bubble domain detection device as defined in claim 1, further comprising the step of planing the structure resulting from the step of lifting off said second mask.
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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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |