US3918151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a multiple magnetic head
Assignee: US Philips Corp
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Filing: 1973-08-13
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Granted: 1975-11-11
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Expires: 1993-08-13
Abstract
Abstract A method of providing screening plates in multiple magnetic heads. Upon manufacturing multiple magnetic heads composed of two or more mouldings of ferrite cemented together, in which the screening plates are cemented in sawcuts arranged in said mouldings, the screening plates are arranged at an angle with the axis of their cut so as to prevent engagement on one side of a screening plate against a wall of its cut.
Inventors
- 👤 Arie Bol
- 👤 Ginkel Johannes Van
- 👤 Der Schoot Andrianus Henri Van
- 👤 Petrus Henricus Swaanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49053; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A method of manufacturing a multiple magnetic head for magnetic data recording having at least two cores of a magnetizable material, each constituting a substantially closed path for magnetic flux, said cores being separated from each other by a spacing and screening member, the method comprising the steps of: A. placing at least two mouldings of a magnetizable material, having machined surfaces thereon, adjacent each other with their machined surfaces facing each other; B. cementing said mouldings to form an assembly; C. laterally cutting through the assembly to provide at least one lateral cut space for a spacing and screening member; D. placing a screening and spacing member in the provided space of step (C) at an angle to said lateral cut space so as to prevent unilateral engagement of said screening and spacing member against a wall of said space, thereby providing cementing spaces on both sides of said screening and spacing member, and E. cementing said spacing and screening member in said lateral cut space by drawing adhesive into said cementing spaces by capillary action.
Claim 2
Independent Claim
177 words
A method of manufacturing a multiple magnetic head for magnetic data recording having at least two cores of a magnetizable material, each constituting a substantially closed path for magnetic flux, said cores being separated from each other by a spacing and screening member, the method comprising the steps of: A. placing at least two mouldings of a magnetizable material, having machined surfaces thereon, adjacent each other with their machined surfaces facing each other; B. cementing said mouldings to form an assembly; C. laterally cutting through the assembly to provide at least one lateral cut space for a spacing and screening member; D. placing a screening and spacing member in the provided space of step (C) at an angle to said lateral cut space so as to prevent unilateral engagement of said screening and spacing member against a wall of said space, thereby providing cementing spaces on both sides of said screening and spacing member, and E. cementing said spacing and screening member in said lateral cut space by drawing adhesive into said cementing spaces by capillary action.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |