Patent US4489770A successfully refreshed from Google Patents.
US3684841A
Expired / Lapsed
US
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Multi-channel magnetic transducer structure having full width erase head in non-magnetic housing
Assignee: Honeywell Inc
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Filing: 1969-12-30
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Granted: 1972-08-15
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Expires: 1989-12-30
Abstract
Abstract A magnetic transducer structure having an erase core integrally fabricated therewith. The recording/reproducing structure can be provided in a single channel read/write head configuration or a multi-channel read after write head configuration. The erase core is embedded within the magnetic transducer structure and is cylindrical in shape, having an open center portion adapted to accommodate an erase winding and further including a transverse gap that forms a part of the working surface of the magnetic transducer structure. The mass of the erase core is small, eliminating or reducing problems of magnetic retentivity.
Inventors
- 👤 Robert M Boehme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/10; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49027; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055; Y10T29/49059
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A magnetic transducer head having erase, write and read cores therein and a non-magnetic housing, comprising: a. stacked plates forming a plurality of first C-shaped core segments, b. stacked plates forming a plurality of second C-shaped core segments, c. stacked plates forming a plurality of pairs of I-shaped return core segments between said first and second C-shaped core segments, forming a plurality of side-by-side read and write cores having non-magnetic gaps, d. said write and read cores supported in said non-magnetic housing, e. an erase core comprising: 1. a single tubular member of magnetic material extending across all of said gaps, 2. said tubular member having a slit in the form of longitudinal gap aligned and integral with the surface of said transducer head, and 3. a winding extending through said tubular member, f. said erase core located in a hole in said non-magnetic housing in close proximity to said write gap.
Claim 2
Dependent Claim
152 words
A magnetic transducer head having erase, write and read cores therein and a non-magnetic housing, comprising: a. stacked plates forming a plurality of first C-shaped core segments, b. stacked plates forming a plurality of second C-shaped core segments, c. stacked plates forming a plurality of pairs of I-shaped return core segments between said first and second C-shaped core segments, forming a plurality of side-by-side read and write cores having non-magnetic gaps, d. said write and read cores supported in said non-magnetic housing, e. an erase core comprising: 1. a single tubular member of magnetic material extending across all of said gaps, 2. said tubular member having a slit in the form of longitudinal gap aligned and integral with the surface of said transducer head, and 3. a winding extending through said tubular member, f. said erase core located in a hole in said non-magnetic housing in close proximity to said write gap.
Claim 3
Dependent Claim
23 words
said tubular member having a slit in the form of longitudinal gap aligned and integral with the surface of said transducer head, and
Claim 4
Dependent Claim
23 words
said tubular member having a slit in the form of longitudinal gap aligned and integral with the surface of said transducer head, and
Claim 5
Dependent Claim
29 words
A magnetic transducer as set forth in claim 1 wherein said erase core is located in a hole formed in proximity to said write head in said non-magnetic housing.
Claim 6
Dependent Claim
65 words
A magnetic transducer as set forth in claim 1 wherein said non-magnetic housing includes receptacles for receiving said read core, write core and said erase core, said read, write and erase cores having pole faces coextensive to and coincident with the surface of said magnetic head so as to concentrate and intensify the magnetic field provided by said cores in the region of said slit.
Claim 7
Dependent Claim
26 words
a winding extending through said tubular member, f. said erase core located in a hole in said non-magnetic housing in close proximity to said write gap.
Claim 8
Dependent Claim
26 words
a winding extending through said tubular member, f. said erase core located in a hole in said non-magnetic housing in close proximity to said write gap.
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |