Patent US3228092A successfully refreshed from Google Patents.
US3228092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic heads with bonding gap spacers
Assignee: US Philips Corp
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Filing: 1961-08-14
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Granted: 1966-01-11
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Expires: 1981-08-14
Abstract
No abstract record available.
Inventors
- 👤 Johannes Otto Michael V Langen
- 👤 Boersma Tho Tjalke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; 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
116 words
A METHOD OF MANUFACTORING A MAGNETIC HEAD COMPRISING: COVERING WITH A THIN LIQUID LAYER OF WATER-GLASS AT LEAST ONE OF TWO GAP-FORMING PROCESSED SURFACES OF A PAIR OF CIRCUIT PARTS COMPOSED OF SINTERED OXIDIC FERROMAGNETIC MATERIAL, HEATING THE WATER-GLASS TO A TEMPERTURE AT WHICH IT FUSES, PLACING SAID SURFACES IN A POSITION SUCH THAT THEY ARE OPPOSITE EACH OTHER WITH THE WATERGLASS BEING LOCATED BETWEEN THE SURFACES, HEATING THE RESULTING ASSEMBLY TO A TEMPERATURE AT WHICH THE CIRCUIT PARTS ARE BONDED TOGETHER BY MEANS OF THE WATER-GLASS BETWEEN THE SURFACES, PRESING THE SURFACE TOWARD EACH OTHER DURING THE SECOND HEATING STEP UNTIL A PREDETEMINED GAP LENGTH BETWEEN SAID SURFACES IS ATTAINED, AND THEREAFTER COOLING SAID ASSEMBLY.
Claim 2
Independent Claim
116 words
A METHOD OF MANUFACTORING A MAGNETIC HEAD COMPRISING: COVERING WITH A THIN LIQUID LAYER OF WATER-GLASS AT LEAST ONE OF TWO GAP-FORMING PROCESSED SURFACES OF A PAIR OF CIRCUIT PARTS COMPOSED OF SINTERED OXIDIC FERROMAGNETIC MATERIAL, HEATING THE WATER-GLASS TO A TEMPERTURE AT WHICH IT FUSES, PLACING SAID SURFACES IN A POSITION SUCH THAT THEY ARE OPPOSITE EACH OTHER WITH THE WATERGLASS BEING LOCATED BETWEEN THE SURFACES, HEATING THE RESULTING ASSEMBLY TO A TEMPERATURE AT WHICH THE CIRCUIT PARTS ARE BONDED TOGETHER BY MEANS OF THE WATER-GLASS BETWEEN THE SURFACES, PRESING THE SURFACE TOWARD EACH OTHER DURING THE SECOND HEATING STEP UNTIL A PREDETEMINED GAP LENGTH BETWEEN SAID SURFACES IS ATTAINED, AND THEREAFTER COOLING SAID ASSEMBLY.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |