US4150408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin-film magnetic head for reading and writing information
Assignee: US Philips Corp
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Filing: 1977-12-05
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Granted: 1979-04-17
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Expires: 1997-12-05
Abstract
Abstract A thin-film magnetic head for writing information in and reading information from a track of a magnetic recording medium in which the head comprises a magnetically permeable yoke having two limbs between which a writing/reading gap is formed. In a construction in which the limbs of the yoke are opposite to each other, one limb is interrupted by a gap which is bridged by a magneto-resistive reading element.
Inventors
- 👤 Gerrit J. Koel
- 👤 Frederik W. Gorter
- 👤 Jan T. Gerkema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3916; G11B5/3919; G11B5/3922; G11B5/3925; G11B15/00; G11B15/02; G11B15/12; G11B5/3967; G11B5/48; G11B5/488; G11B5/49; G11B5/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A thin-film magnetic head for reading information and writing information in a track of an associated magnetic recording medium which comprises: a magnetically permeable yoke having only first and second substantially parallel and elongated limbs, said first limb having a first elongated gap parallel to the plane of the associated recording medium and intermediate first and second parts thereof, and a magneto-resistive reading element bridging said first gap, said first and second limbs being disposed in spaced relationship with a reading/writing gap between the free ends of said limbs said reading/writing gap being parallel to said first gap and, said magneto-resistive element being disposed in spaced relationship from the associated recording medium and said reading/writing gap, an electric conductor disposed within said reading/writing gap contiguous to said free end, said conductor cooperating with an associated means for producing a writing current during writing.
Claim 2
Dependent Claim
143 words
A thin-film magnetic head for reading information and writing information in a track of an associated magnetic recording medium which comprises: a magnetically permeable yoke having only first and second substantially parallel and elongated limbs, said first limb having a first elongated gap parallel to the plane of the associated recording medium and intermediate first and second parts thereof, and a magneto-resistive reading element bridging said first gap, said first and second limbs being disposed in spaced relationship with a reading/writing gap between the free ends of said limbs said reading/writing gap being parallel to said first gap and, said magneto-resistive element being disposed in spaced relationship from the associated recording medium and said reading/writing gap, an electric conductor disposed within said reading/writing gap contiguous to said free end, said conductor cooperating with an associated means for producing a writing current during writing.
Claim 3
Dependent Claim
51 words
A magnetic head as claimed in claim 1, wherein said limbs having first and second elongated sides, said first elongated sides being coplanar proximate to said reading/writing gap and said second elongated sides being coplanar proximate to said reading/writing gap all of said coplanar sides being disposed normal to said gaps.
References Cited (Backward Citations)
US3947889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |