Patent US4860139A successfully refreshed from Google Patents.
US4860139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planarized read/write head and method
Assignee: Seagate Technology LLC
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Filing: 1987-06-19
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Granted: 1989-08-22
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Expires: 2007-06-19
Abstract
Abstract A probe-type, electromagnetic read/write head for perpendicular reading and writing, and a method for making the same, wherein the resulting head is characterized by a flux-return portion, and a pole portion which is spaced from but magnetically coupled to the pole portion, with its side which faces the flux-return portion, throughout its entirety, being planar.
Inventors
- 👤 Harold J. Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49044; Y10T29/49046; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A thin-film, probe-type, electromagnetic read/write head for perpendicular reading and writing comprising a flux-return portion, plural-turn coil means for carrying electrical current embedded in insulator means disposed to one side of said flux-return portion, said insulator means having a planar facial expanse substantially paralleling and facing away from said flux-return portion, a pole portion spaced from but magnetically coupled to said flux-return portion, said pole portion including a side facing said flux-return portion, said side, throughout its entirety, residing on said facial expanse, and a film of magnetic material formed on the side of said pole portion which is opposite the latter's first-mentioned side and cooperating with the pole portion to create a yoke in the head, said coil means, insulator means, pole portion and film residing in compact, parallel abutting planes.
Claim 2
Dependent Claim
132 words
A thin-film, probe-type, electromagnetic read/write head for perpendicular reading and writing comprising a flux-return portion, plural-turn coil means for carrying electrical current embedded in insulator means disposed to one side of said flux-return portion, said insulator means having a planar facial expanse substantially paralleling and facing away from said flux-return portion, a pole portion spaced from but magnetically coupled to said flux-return portion, said pole portion including a side facing said flux-return portion, said side, throughout its entirety, residing on said facial expanse, and a film of magnetic material formed on the side of said pole portion which is opposite the latter's first-mentioned side and cooperating with the pole portion to create a yoke in the head, said coil means, insulator means, pole portion and film residing in compact, parallel abutting planes.
Claim 3
Independent Claim
145 words
A method of making a thin-film, probe-type, electromagnetic read/write head for perpendicular reading and writing comprising preparing a flux-return portion, forming on one side of such flux-return portion a plural-turn electrical current-carrying coil embedded in insulator structure with the latter having a planar facial expanse substantially paralleling and facing away from the flux-return portion, creating, in spaced and magnetically coupled relation to the flux-return portion, a pole portion which includes a side facing the flux-return portion characterized throughout by planarity, preparing on the side of such pole portion which is opposite the latter's first-mentioned side a film of magnetic material which cooperates with the pole portion to produce a yoke in the head, and executing the above steps in such a manner as to produce a head wherein the coil, the insulator structure, the pole portion and the film reside in compact, parallel abutting planes.
Claim 4
Independent Claim
145 words
A method of making a thin-film, probe-type, electromagnetic read/write head for perpendicular reading and writing comprising preparing a flux-return portion, forming on one side of such flux-return portion a plural-turn electrical current-carrying coil embedded in insulator structure with the latter having a planar facial expanse substantially paralleling and facing away from the flux-return portion, creating, in spaced and magnetically coupled relation to the flux-return portion, a pole portion which includes a side facing the flux-return portion characterized throughout by planarity, preparing on the side of such pole portion which is opposite the latter's first-mentioned side a film of magnetic material which cooperates with the pole portion to produce a yoke in the head, and executing the above steps in such a manner as to produce a head wherein the coil, the insulator structure, the pole portion and the film reside in compact, parallel abutting planes.
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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |