US3603941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination of two or more shielded magnetic heads having at least one writing head and at least one reading head
Assignee: US Philips Corp
•
Filing: 1968-08-16
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Granted: 1971-09-07
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Expires: 1988-08-16
Abstract
Abstract A shielded multiple magnetic head wherein the heads are electrically screened from each other by a box-shaped enclosure of electrically conductive material. The bottom of the enclosure surrounds the lower portion of the head. The top of the enclosure interrupts the head between the upper and lower portions thereof.
Inventors
- 👤 Jacob Koorneef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A shielded multiple magnetic head comprising two or more magnetic heads including at least one writing head and at least one reading head, each of said heads being composed of a core of magnetic material which is electrically poorly conductive and is substantially annular with a nonmagnetic effective gap, wire turns being arranged around at least one part of each core, each head having an upper portion including a front face containing said gap and a wire turn supporting lower portion for completing the magnetic core, said heads being screened electrically from each other by an enclosed box of electrically conductive material completely surrounding said lower portion of at least one of the heads, the upper face of said box interrupting said head between said upper and lower portion, the upper portion of said one of said heads projecting above the upper face of said box, said upper face being an electrically conductive screening connected to the box in an electrically conductive manner for interrupting said magnetic head between said upper and lower portions.
Claim 2
Dependent Claim
174 words
A shielded multiple magnetic head comprising two or more magnetic heads including at least one writing head and at least one reading head, each of said heads being composed of a core of magnetic material which is electrically poorly conductive and is substantially annular with a nonmagnetic effective gap, wire turns being arranged around at least one part of each core, each head having an upper portion including a front face containing said gap and a wire turn supporting lower portion for completing the magnetic core, said heads being screened electrically from each other by an enclosed box of electrically conductive material completely surrounding said lower portion of at least one of the heads, the upper face of said box interrupting said head between said upper and lower portion, the upper portion of said one of said heads projecting above the upper face of said box, said upper face being an electrically conductive screening connected to the box in an electrically conductive manner for interrupting said magnetic head between said upper and lower portions.
Claim 3
Dependent Claim
18 words
A combination as claimed in claim 1, wherein each head lower portion is accommodated in an enclosed box.
Claim 4
Dependent Claim
151 words
A combination as claimed in claim 1 wherein that part of the electrically conductive screening of the upper face of the box interrupting said head is comb shaped. The restriction requirement is noted. As stated by the Examiner, Group 1 is elected, relating to the article. The restriction requirement is traversed however, in view of the fact that the subject matter of both sets of claims are so interrelated that a record of one set would be duplicative of a search on the other set. In the interests of saving applicant the expense and time necessary for filing of a divisional application, and in the interest of the public in attempting to reduce the backlog of the Patent Office, particularly where duplicative effort is involved, it is respectfully requested that an action on the merits be rendered upon group 11. Amendments have been made to the disclosure where electrically conductive manner.
Claim 5
Dependent Claim
23 words
A combination as claimed in claim 1, wherein the electrically conductive screening in the upper face of the box fully seals the box.
References Cited (Backward Citations)
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US3079467A
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US3321586A
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |