Patent US4494160A successfully refreshed from Google Patents.
US4494160A
Expired / Lapsed
US
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Magnetic head and method of manufacturing a magnetic head
Assignee: US Philips Corp
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Filing: 1981-11-20
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Granted: 1985-01-15
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Expires: 2001-11-20
Abstract
Abstract A multitrack magnetic head particularly suitable for automatic assembly comprises a first set of core parts (17) which are rigidly fixed on a first flat base plate (16) and a second set of core parts (31) which are rigidly fixed on a second flat base plate (19). A screening plate (35) is located between cores of the first and second core parts (17,31) and is welded to the flat base plates with its oppositely located longitudinal edges. The screening plate is preferably located with one side against the first base plate and with the oppositely located side against a resilient lug projecting inwardly from the plane of the second base plate.
Inventors
- 👤 Jan Bakker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A multitrack magnetic head which comprises: a first magnetic core, the first cone including first and second core parts which define a first transducing gap; a second magnetic core arranged adjacent the first core, the second core including third and fourth core parts which define a second transducing gap; a first core support for supporting the first and third core parts; a second core support for supporting the second and fourth core parts, the first and second core supports being secured together, and a screening plate disposed between the first and the second magnetic cores, characterized in that the first and the second core supports comprise, respectively, first and second base plates each having a substantially flat major portion, the core parts being secured to the major portions of the respective base plates, and that the screening plate is secured directly to the major portions of the first and the second base plates so that the supports are secured together by the plate.
Claim 2
Dependent Claim
163 words
A multitrack magnetic head which comprises: a first magnetic core, the first cone including first and second core parts which define a first transducing gap; a second magnetic core arranged adjacent the first core, the second core including third and fourth core parts which define a second transducing gap; a first core support for supporting the first and third core parts; a second core support for supporting the second and fourth core parts, the first and second core supports being secured together, and a screening plate disposed between the first and the second magnetic cores, characterized in that the first and the second core supports comprise, respectively, first and second base plates each having a substantially flat major portion, the core parts being secured to the major portions of the respective base plates, and that the screening plate is secured directly to the major portions of the first and the second base plates so that the supports are secured together by the plate.
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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |