Patent US4419705A successfully refreshed from Google Patents.
US4419705A
Expired / Lapsed
US
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Ferrite beveled core for magnetic head
Assignee: EMC Corp
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Filing: 1981-05-01
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Granted: 1983-12-06
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Expires: 2001-05-01
Abstract
Abstract A core for a magnetic head assembly includes a T-shaped ferrite member having an aperture for the transducing coil and a beveled edge along the top of the T. A ceramic body has a first slot in which the arms of the T-shaped member are positioned and a cross-slot which is deeper than the first slot. The vertical portion of the T-shaped ferrite core is positioned in the cross-slot.
Inventors
- 👤 Ralph D. Brower
- 👤 Paul D. Losee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; G11B5/10; G11B5/133
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
38 words
A core for a magnetic head assembly comprising: a T-shaped ferrite member having an aperture for receiving a transducing coil and a beveled edge along the top of the T for disposition adjacent to a magnetic recording medium.
Claim 2
Dependent Claim
38 words
A core for a magnetic head assembly comprising: a T-shaped ferrite member having an aperture for receiving a transducing coil and a beveled edge along the top of the T for disposition adjacent to a magnetic recording medium.
Claim 3
Dependent Claim
15 words
The core recited in claim 1 further comprising a magnetic gap across said beveled edge.
Claim 4
Dependent Claim
37 words
The core recited in claim 2 wherein said T-shaped ferrite member comprises two pieces which abut each other along the vertical of the T, the abutment of said pieces across said beveled edge forming said magnetic gap.
Claim 5
Dependent Claim
91 words
A magnetic head assembly comprising: a T-shaped ferrite member having an aperture for receiving a transducing coil and a beveled edge along the top of the T for disposition adjacent to a magnetic recording medium; a ceramic body having a first slot in which the arms of said T-shaped member are disposed and a cross-slot which is deeper than said first slot, the vertical portion of said T-shaped ferrite member being disposed in said cross slot, said cross-slot and said aperture providing a path for winding a coil on said assembly.
Claim 6
Dependent Claim
91 words
A magnetic head assembly comprising: a T-shaped ferrite member having an aperture for receiving a transducing coil and a beveled edge along the top of the T for disposition adjacent to a magnetic recording medium; a ceramic body having a first slot in which the arms of said T-shaped member are disposed and a cross-slot which is deeper than said first slot, the vertical portion of said T-shaped ferrite member being disposed in said cross slot, said cross-slot and said aperture providing a path for winding a coil on said assembly.
Claim 7
Dependent Claim
15 words
The assembly recited in claim 4 further comprising a magnetic gap across said beveled edge.
Claim 8
Dependent Claim
37 words
The assembly recited in claim 5 wherein said T-shaped ferrite member comprises two pieces which abut each other along the vertical of the T, the abutment of said pieces across said beveled edge forming said magnetic gap.
Claim 9
Dependent Claim
35 words
The assembly recited in claim 4 wherein the faces of said body on both sides of said first slot form slider rails which develop an air bearing when said assembly engages a rotating magnetic medium.
Claim 10
Dependent Claim
43 words
The assembly recited in claim 7 further comprising third and fourth slots parallel to and on opposite sides of said first slot in said slider, the faces of said body and the beveled edge of said T-shaped member forming a penta rail assembly.
Claim 11
Dependent Claim
11 words
The assembly recited in claim 1 formed into a circular button.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |