US3224074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a magnetic recording head structure
Assignee: GTE Sylvania Inc
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Filing: 1963-08-07
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Granted: 1965-12-21
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Expires: 1983-08-07
Abstract
No abstract record available.
Inventors
- 👤 Charles J Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:05
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; Y10T29/49036; Y10T29/49043; Y10T29/4906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF MAKING A MAGNETIC TRANSDUCER HEAD HAVING A CORE OF MAGNETIC MATERIAL WITH A GAP THEREIN SUPPORTED ON A NON-MAGNETIC SUPPORTING MEMBER AND HAVING A WINDING AROUND THE CORE, WHICH COMPRISES THE STEPS OF: DEPOSITING A THIN FILM LOOP OF MAGNETIC MATERIAL ON A SUPPORT MEMBER FORMED OF NON-MAGNETIC MATERIAL, COATING SAID FILM WIH AN ETCHANT-RESISTANT MATERIAL, REMOVING A STRIP OF SAID ETCHANT-RESISTANT MATERIAL TO EXPOSE AN AREA OF SAID FILM HAVING THE DESIRED LOCATION AND DIMENSIONS OF SAID GAP, SUBJECTING SAID EXPOSED AREA
Claim 2
Independent Claim
86 words
A METHOD OF MAKING A MAGNETIC TRANSDUCER HEAD HAVING A CORE OF MAGNETIC MATERIAL WITH A GAP THEREIN SUPPORTED ON A NON-MAGNETIC SUPPORTING MEMBER AND HAVING A WINDING AROUND THE CORE, WHICH COMPRISES THE STEPS OF: DEPOSITING A THIN FILM LOOP OF MAGNETIC MATERIAL ON A SUPPORT MEMBER FORMED OF NON-MAGNETIC MATERIAL, COATING SAID FILM WIH AN ETCHANT-RESISTANT MATERIAL, REMOVING A STRIP OF SAID ETCHANT-RESISTANT MATERIAL TO EXPOSE AN AREA OF SAID FILM HAVING THE DESIRED LOCATION AND DIMENSIONS OF SAID GAP, SUBJECTING SAID EXPOSED AREA
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |