US3333332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing parts of annular magnetic heads
Assignee: US Philips Corp
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Filing: 1964-03-03
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Granted: 1967-08-01
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Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Vrolijks Matthijs Henric Maria
- 👤 Koorneef Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/232; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A METHOD OF MANUFACTURING PORTIONS OF MAGNETIC TRANSDUCER HEADS HAVING TWO CIRCUIT PARTS OF SINTERED OXIDIC FERROMAGNETIC MATERIAL, ONE OF SAID PARTS BEING CHANNEL-SHAPED AND HAVING AT LEAST ONE FACE OF A GAPBOUNDARY AT ONE SIDE OF SAID CHANNEL, THE OTHER OF SAID CIRCUIT PARTS HAVING ANOTHER GAP-BOUNDARY FACE, COMPRISING THE STEPS OF: PLACING SAID SECOND CIRCUIT PART ADJACENT SAID FIRST CIRCUIT PART WITH THE RESPECTIVE GAPBOUNDARY FACES FACING EACH OTHER, INTERPOSING FIRST AND SECOND SPACING MEANS BETWEEN FACING GAP-BOUNDARY FACES AT ONE SIDE OF SAID CHANNEL, SAID SPACING MEANS EACH HAVING A THICKNESS GREATER THAN THE DESIRED GAP LENGTH AT SAID ONE SIDE OF SAID CHANNEL, MAINTAINING SAID PARTS IN ABUTTING CONTACT AT THE OTHER SIDE OF SAID CHANNEL THEREBY TO POSITION SAID GAP-BOUNDARY FACES WITH THEIR OPPOSING SURFACES IN A NON-PARALLEL RELATIONSHIP, PLACING A QUANITTY OF FUSIBLE MATERIAL ADJACENT TO SAID GAP FACES, HEATING THE RESULTING ASSEMBLY TO THE MELTING TEMPERATURE OF THE FUSIBLE MATERIAL UNTIL THE FUSIBLE MATERIAL IS DRAWN BETWEEN THE GAP FACES BY CAPILLARY ACTION, COOLING SAID ASSEMBLY REMOVING SAID SPACING MEANS BY CUTTING SAID ASSEMBLY THROUGH THE GAP BOUNDARY FACES TO FORM A SURFACE, AND FINISHING SAID SURFACES.
Claim 2
Independent Claim
194 words
A METHOD OF MANUFACTURING PORTIONS OF MAGNETIC TRANSDUCER HEADS HAVING TWO CIRCUIT PARTS OF SINTERED OXIDIC FERROMAGNETIC MATERIAL, ONE OF SAID PARTS BEING CHANNEL-SHAPED AND HAVING AT LEAST ONE FACE OF A GAPBOUNDARY AT ONE SIDE OF SAID CHANNEL, THE OTHER OF SAID CIRCUIT PARTS HAVING ANOTHER GAP-BOUNDARY FACE, COMPRISING THE STEPS OF: PLACING SAID SECOND CIRCUIT PART ADJACENT SAID FIRST CIRCUIT PART WITH THE RESPECTIVE GAPBOUNDARY FACES FACING EACH OTHER, INTERPOSING FIRST AND SECOND SPACING MEANS BETWEEN FACING GAP-BOUNDARY FACES AT ONE SIDE OF SAID CHANNEL, SAID SPACING MEANS EACH HAVING A THICKNESS GREATER THAN THE DESIRED GAP LENGTH AT SAID ONE SIDE OF SAID CHANNEL, MAINTAINING SAID PARTS IN ABUTTING CONTACT AT THE OTHER SIDE OF SAID CHANNEL THEREBY TO POSITION SAID GAP-BOUNDARY FACES WITH THEIR OPPOSING SURFACES IN A NON-PARALLEL RELATIONSHIP, PLACING A QUANITTY OF FUSIBLE MATERIAL ADJACENT TO SAID GAP FACES, HEATING THE RESULTING ASSEMBLY TO THE MELTING TEMPERATURE OF THE FUSIBLE MATERIAL UNTIL THE FUSIBLE MATERIAL IS DRAWN BETWEEN THE GAP FACES BY CAPILLARY ACTION, COOLING SAID ASSEMBLY REMOVING SAID SPACING MEANS BY CUTTING SAID ASSEMBLY THROUGH THE GAP BOUNDARY FACES TO FORM A SURFACE, AND FINISHING SAID SURFACES.
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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |