US3246383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing magnetic heads with bonding gap-filling materials
Assignee: US Philips Corp
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Filing: 1963-05-03
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Granted: 1966-04-19
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Expires: 1983-05-03
Abstract
No abstract record available.
Inventors
- 👤 Peloschek Hans Peter
- 👤 Vrolijks Matthijs Henric Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:22
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; Y10T29/49073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD OF MANUFACTURING PORTIONS OF MAGNETIC HEADS COMPOSED OF TWO MAGNETIC CIRCUIT PARTS CONSISTING OF SINTERED OXIDIC FERROMAGNETIC MATERIAL AND HAVING CONFRONTING GAP SURFACES WITH A GAP THEREBETWEEN FILLED WITH A NONMAGNETIC MATERIAL BONDING THE CIRCUIT PARTS TOGETHER, COMPRISING: PLACING SPACING MEMBERS HAVING A THICKNESS EQUAL TO THE DESIRED GAP LENGTH AT OPPOSITE ENDS OF A FIRST POLISHED GAP SURFACE OF ONE CIRCUIT PART, PLACING A CORRESPONGING POLISHED GAP SURFACE OF A SECOND CRICUIT PART ON SAID SPACING MEMBERS IN CONFRONTING RELATIONSHIP WITH SAID FIRST SURFACE THEREBY FORMING A GAP BETWEEN SAID SURFACES, PLACING A QUANTITY OF NONMAGNETIC MATERIAL ADJACENT TO THE GAP, SAID NONMAGNETIC MATERIAL HAVING A MELTING TEMPEATURE BELOW THAT OF SAID FERROMAGNETIC MATERIAL, AND HEATING THE RESULTING ASSEMBLY TO THE MELTING TEMPERATURE OF SAID NONMAGNETIC MATERIAL, WHEREBY SAID NONMAGNETIC MATERIAL MELTS, FILLS THE GAP BY CAPILARY ACTION, AND BONDS THE CIRCUIT PARTS TOGETHER.
Claim 2
Independent Claim
147 words
A METHOD OF MANUFACTURING PORTIONS OF MAGNETIC HEADS COMPOSED OF TWO MAGNETIC CIRCUIT PARTS CONSISTING OF SINTERED OXIDIC FERROMAGNETIC MATERIAL AND HAVING CONFRONTING GAP SURFACES WITH A GAP THEREBETWEEN FILLED WITH A NONMAGNETIC MATERIAL BONDING THE CIRCUIT PARTS TOGETHER, COMPRISING: PLACING SPACING MEMBERS HAVING A THICKNESS EQUAL TO THE DESIRED GAP LENGTH AT OPPOSITE ENDS OF A FIRST POLISHED GAP SURFACE OF ONE CIRCUIT PART, PLACING A CORRESPONGING POLISHED GAP SURFACE OF A SECOND CRICUIT PART ON SAID SPACING MEMBERS IN CONFRONTING RELATIONSHIP WITH SAID FIRST SURFACE THEREBY FORMING A GAP BETWEEN SAID SURFACES, PLACING A QUANTITY OF NONMAGNETIC MATERIAL ADJACENT TO THE GAP, SAID NONMAGNETIC MATERIAL HAVING A MELTING TEMPEATURE BELOW THAT OF SAID FERROMAGNETIC MATERIAL, AND HEATING THE RESULTING ASSEMBLY TO THE MELTING TEMPERATURE OF SAID NONMAGNETIC MATERIAL, WHEREBY SAID NONMAGNETIC MATERIAL MELTS, FILLS THE GAP BY CAPILARY ACTION, AND BONDS THE CIRCUIT PARTS TOGETHER.
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |