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US3566045A
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Magnetic recording head and method of making same
Assignee: National Aeronautics and Space Administration
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Filing: 1968-09-26
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Granted: 1971-02-23
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Expires: 1988-09-26
Abstract
Abstract A magnetic recording head comprising a ferrite core having a thin film of Alfesil coated thereon and a method of producing same using a plasma arc sputtering technique.
Inventors
- 👤 James D Kern
- 👤 Valdimar W Vodicka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:25
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1875; G11B5/1877; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49067
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
A magnetic recording head comprising a ferrite core having a thin film of Alfesil plasma arc sputtered directly thereon.
Claim 2
Dependent Claim
19 words
A magnetic recording head comprising a ferrite core having a thin film of Alfesil plasma arc sputtered directly thereon.
Claim 3
Dependent Claim
21 words
A magnetic recoding as in claim 1 wherein the thickness of the Alfesil film is from 0.0015 inches to 0.004 inches.
Claim 4
Independent Claim
21 words
A method of producing a magnetic recording head coMprising plasma arc sputtering a coating of Alfesil directly to a ferrite core.
Claim 5
Independent Claim
21 words
A method of producing a magnetic recording head coMprising plasma arc sputtering a coating of Alfesil directly to a ferrite core.
Claim 6
Dependent Claim
16 words
The method of claim 3 wherein the Alfesil coating is from 0.0015 to 0.004 inches thick.
References Cited (Backward Citations)
US3268987A
Cited
US3335412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |