Patent US3353261A successfully refreshed from Google Patents.
US3353261A
Expired / Lapsed
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Method of making a multitrack magnetic transducer head
Assignee: International Business Machines Corp
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Filing: 1964-12-30
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Granted: 1967-11-21
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 Rex C Bradford
- 👤 Henry R Kelsof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048; Y10T29/49053; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
THE METHOD OF MAKING A MULTITRACK MAGNETIC HEAD COMPRISING: PROVIDING EACH OF A PAIR OF BLOCKS OF A HIGH RESISTIVITY MATERIAL WITH AN OPTICALLY FLAT POLISHED PLANAR SURFACE; LOCATING SAID BLOCKS SO THAT SAID SURFACES ARE SPACED SLIGHTLY FROM EACH OTHER IN CONFRONTING RELATION; JOINING SAID BLOCKS TO EACH OTHER BY MEANS OF A BONDING MATERIAL; PROVIDING A PLURALITY OF PROJECTIONS ON ONE BLOCK WHICH ARE SPACED FROM BUT CONFRONT A LIKE NUMBER OF PROJECTIONS ON THE OTHER BLOCK BY FORMING AT LEAST ONE CHANNEL EXTENDING INTO EACH OF SAID BLOCKS AND INTO SAID BONDING MATERIAL; ATTACHING A COILED JUMPER ASSEMBLY TO EACH CONFORNTING PAIR OF PROJECTIONS; SECURING A SHIELD INTO EACH CHANNEL IN SUCH MANNER THAT EACH PAIR OF CONFRONTING PROJECTIONS IS SECURED TO ITS CLOSEST ADJACENT NEIGHBORING PAIR OF PROJECTIONS BOTH BY MEANS OF AN INTERVENING SHIELD AND BY MEANS OF THAT PORTION OF EACH BLOCK AND THAT PORTION OF THE BONDING MATERIAL THAT LIE BEYOND SAID PROJECTIONS; AND REMOVING AT LEAST SAID PORTIONS OF EACH BLOCK AND SAID PORTION OF BONDING MATERIAL WHEREBY A PLURALITY OF FUNCTIONALLY INDEPENDANT TRACKS IS FORMED IN A SINGLE HEAD UNIT.
Claim 2
Independent Claim
189 words
THE METHOD OF MAKING A MULTITRACK MAGNETIC HEAD COMPRISING: PROVIDING EACH OF A PAIR OF BLOCKS OF A HIGH RESISTIVITY MATERIAL WITH AN OPTICALLY FLAT POLISHED PLANAR SURFACE; LOCATING SAID BLOCKS SO THAT SAID SURFACES ARE SPACED SLIGHTLY FROM EACH OTHER IN CONFRONTING RELATION; JOINING SAID BLOCKS TO EACH OTHER BY MEANS OF A BONDING MATERIAL; PROVIDING A PLURALITY OF PROJECTIONS ON ONE BLOCK WHICH ARE SPACED FROM BUT CONFRONT A LIKE NUMBER OF PROJECTIONS ON THE OTHER BLOCK BY FORMING AT LEAST ONE CHANNEL EXTENDING INTO EACH OF SAID BLOCKS AND INTO SAID BONDING MATERIAL; ATTACHING A COILED JUMPER ASSEMBLY TO EACH CONFORNTING PAIR OF PROJECTIONS; SECURING A SHIELD INTO EACH CHANNEL IN SUCH MANNER THAT EACH PAIR OF CONFRONTING PROJECTIONS IS SECURED TO ITS CLOSEST ADJACENT NEIGHBORING PAIR OF PROJECTIONS BOTH BY MEANS OF AN INTERVENING SHIELD AND BY MEANS OF THAT PORTION OF EACH BLOCK AND THAT PORTION OF THE BONDING MATERIAL THAT LIE BEYOND SAID PROJECTIONS; AND REMOVING AT LEAST SAID PORTIONS OF EACH BLOCK AND SAID PORTION OF BONDING MATERIAL WHEREBY A PLURALITY OF FUNCTIONALLY INDEPENDANT TRACKS IS FORMED IN A SINGLE HEAD UNIT.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |