US3672043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature magnetic head
Assignee: Magnetic Peripherals Inc
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Filing: 1970-04-29
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Granted: 1972-06-27
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Expires: 1990-04-29
Abstract
Abstract This invention relates generally to magnetic transducer devices, and more particularly to a novel magnetic transducer construction and method of making.
Inventors
- 👤 Cebern B Trimble
- 👤 Robert R Skutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/1272; G11B5/31; G11B5/3103; G11B5/3163; G11B5/3176; G11B5/3179; G11B5/3183; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49044; Y10T29/4906; Y10T29/49062; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A method of making a magnetic head comprising the steps of: forming spaced pole tip recesses in a non-magnetic substrate, depositing magnetic material in said recesses, providing at least one magnetic material path between said pole tips, smoothing said pole tips and at least the substrate surface in the immediate vicinity thereof into a common surface, and coupling a winding to said magnetic path.
Claim 2
Independent Claim
64 words
A method of making a magnetic head comprising the steps of: forming spaced pole tip recesses in a non-magnetic substrate, depositing magnetic material in said recesses, providing at least one magnetic material path between said pole tips, smoothing said pole tips and at least the substrate surface in the immediate vicinity thereof into a common surface, and coupling a winding to said magnetic path.
Claim 3
Dependent Claim
28 words
The invention in accordance with claim 1, wherein said magnetic material path is provided by depositing a layer of magnetic material on said substrate between said pole tips.
Claim 4
Dependent Claim
20 words
The invention in accordance with claim 1, wherein said recesses are formed with a depth of less than 0.5 mil.
Claim 5
Dependent Claim
33 words
The invention in accordance with claim 2, wherein said recesses are formed with a depth of less than 0.5 mil and said layer is formed with a thickness of less than 2 mils.
Claim 6
Dependent Claim
35 words
The invention in accordance with claim 1, wherein the steps of forming said spaced pole tip recesses and of depositing magnetic material therein are simultaneously performed for a plurality of heads on the saMe substrate.
Claim 7
Dependent Claim
21 words
The invention in accordance with claim 2, wherein said magnetic material path is deposited in a recess provided in said substrate.
Claim 8
Dependent Claim
29 words
The invention in accordance with claim 2, wherein said magnetic material path is provided by first depositing a conductive base layer and then electroplating the magnetic material path thereon.
Claim 9
Dependent Claim
14 words
The invention in accordance with claim 1, wherein said common surface is a plane.
Claim 10
Dependent Claim
60 words
The invention in accordance with claim 2, wherein the step of depositing magnetic material in said pole tip recesses also includes depositing said magnetic material over portions of said substrate adjacent said pole tip recesses, and wherein the step of smoothing removes the deposited material from the adjacent substrate portions so as to define said pole tips and transducing gap.
Claim 11
Dependent Claim
33 words
The invention in accordance with claim 2, wherein the inner portions of said pole tip recesses are tapered so that the width of said transducing gap is controlled by the amount of smoothing.
Claim 12
Dependent Claim
14 words
The invention in accordance with claim 1, wherein said recesses are formed by etching.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |