US3224073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making multi-track magnetic heads
Assignee: US Philips Corp
•
Filing: 1963-05-02
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Granted: 1965-12-21
•
Expires: 1983-05-02
Abstract
No abstract record available.
Inventors
- 👤 Peloschek Hans Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:13
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/295; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
A METHOD OF MANUFACTURING A PORTION OF A MULTITRACK MAGNETIC HEAD, COMPRISING: PROVIDING A PLURALITY OF SPACED-APART GROOVES IN THE SIDES OF A CHANNEL-SHAPED HOLDER COMPOSED OF NONMAGNETIC FERRITE, SAID HOLDER HAVING A PLURALITY OF ABUTMENTS SPACED EQUALLY BETWEEN SAID SIDES AND PROJECTING FROM THE BOTTOM OF THE HOLDER IN THE SAME DIRECTION AND HAVING THE SAME HEIGHT AS SAID SIDES, EACH ABUTMENT BEING ALIGNED WITH A CORRESPONDING PAIR OF SOLID PORTIONS OF SAID SIDES, CEMENTING A CHANNEL-SHAPED CORE COMPOSED OF MAGNETIC FERRITE IN EACH PAIR OF CORRESPONDING GROOVES, THE GROOVES HAVING A DEPTH SUCH THAT AFTER A CORE IS PLACED THEREIN THE UPPER SURFACES OF THE SIDES OF THE HOLER AND THE UPPER SURFACES OF THE CORE ARE SUBSTANTIALLY CO-PLANAR, POLISHING ALL OF SAID SURFACES, DIVIDING THE RESULTING ASSEMBLY INTO TWO PARTS ALONG A PLANE PASSING THROUGH SAID ABUTMENTS TRANSVERSELY THROUGH THE HOLDER, AND BONDING SAID PARTS TOGETHER AT SAID SURFACES WITH NONMAGNETIC BONDING MATERIAL, CORRESPONDING PORTIONS OF SAID PARTS BEING LOCATED ADJACENT EACH OTHER WITH THE NONMAGNETIC BONDING MATERIAL BEING LOCATED THEREBETWEEN, WHEREBY THE BONDING MATERIAL LOCATED BETWEEN ADJACENT CORE SURFACES PROVIDES THE GAP FOR EACH HEAD.
Claim 2
Independent Claim
189 words
A METHOD OF MANUFACTURING A PORTION OF A MULTITRACK MAGNETIC HEAD, COMPRISING: PROVIDING A PLURALITY OF SPACED-APART GROOVES IN THE SIDES OF A CHANNEL-SHAPED HOLDER COMPOSED OF NONMAGNETIC FERRITE, SAID HOLDER HAVING A PLURALITY OF ABUTMENTS SPACED EQUALLY BETWEEN SAID SIDES AND PROJECTING FROM THE BOTTOM OF THE HOLDER IN THE SAME DIRECTION AND HAVING THE SAME HEIGHT AS SAID SIDES, EACH ABUTMENT BEING ALIGNED WITH A CORRESPONDING PAIR OF SOLID PORTIONS OF SAID SIDES, CEMENTING A CHANNEL-SHAPED CORE COMPOSED OF MAGNETIC FERRITE IN EACH PAIR OF CORRESPONDING GROOVES, THE GROOVES HAVING A DEPTH SUCH THAT AFTER A CORE IS PLACED THEREIN THE UPPER SURFACES OF THE SIDES OF THE HOLER AND THE UPPER SURFACES OF THE CORE ARE SUBSTANTIALLY CO-PLANAR, POLISHING ALL OF SAID SURFACES, DIVIDING THE RESULTING ASSEMBLY INTO TWO PARTS ALONG A PLANE PASSING THROUGH SAID ABUTMENTS TRANSVERSELY THROUGH THE HOLDER, AND BONDING SAID PARTS TOGETHER AT SAID SURFACES WITH NONMAGNETIC BONDING MATERIAL, CORRESPONDING PORTIONS OF SAID PARTS BEING LOCATED ADJACENT EACH OTHER WITH THE NONMAGNETIC BONDING MATERIAL BEING LOCATED THEREBETWEEN, WHEREBY THE BONDING MATERIAL LOCATED BETWEEN ADJACENT CORE SURFACES PROVIDES THE GAP FOR EACH HEAD.
References Cited (Backward Citations)
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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) | 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 |