US3145453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing magnetic heads with bonding glass gap spacers
Assignee: US Philips Corp
•
Filing: 1961-05-08
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Granted: 1964-08-25
•
Expires: 1981-05-08
Abstract
No abstract record available.
Inventors
- 👤 Duinker Simon
- 👤 Bos Jules
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:08
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235; C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; G11B5/232; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/50; C04B2237/52; C04B2237/62; C04B2237/70; C04B2237/708; C04B2237/76; C04B2237/78; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/49057; Y10T29/49071
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF MANUFACTURING AN ANNULAR MAGNETIC HEAD HAVING AT LEAST TWO CIRCUIT PARTS COMPOSED OF FERRITE AND AN EFFECTIVE GAP BETWEEN SAID PARTS, EACH OF SAID PARTS HAVING AT LEAST ONE GAP SURFACE, COMPRISING THE STEPS OF POLISHING THE GAP SURFACES ON SAID CIRCUIT PARTS, INTERPOSING A GLASS SHIM DIRECTLY BETWEEN AND CONTACTING THE POLISHED GAP SURFACES, SAID SHIM HAVING A THICKNESS SLIGHTLY EXCEEDING THE DESIRED GAP WIDTH, HEATING THE RESULTANT ASSEMBLY TO A TEMPERATURE LYING IN THE SOFTENING RANGE OF THE GLASS AND COMPRESSING THE TWO CIRCUIT PARTS AGAINST THE GLASS SHIM AT A TEMPERATURE IN SAID SOFTENING RANGE UNTIL THE DESIRED GAP WIDTH IS ACHIEVED, SAID GLASS ACTING UPON HARDENING AS A GAP SPACER AND AS A BONDER FOR THE CIRCUIT PARTS.
Claim 2
Independent Claim
125 words
A METHOD OF MANUFACTURING AN ANNULAR MAGNETIC HEAD HAVING AT LEAST TWO CIRCUIT PARTS COMPOSED OF FERRITE AND AN EFFECTIVE GAP BETWEEN SAID PARTS, EACH OF SAID PARTS HAVING AT LEAST ONE GAP SURFACE, COMPRISING THE STEPS OF POLISHING THE GAP SURFACES ON SAID CIRCUIT PARTS, INTERPOSING A GLASS SHIM DIRECTLY BETWEEN AND CONTACTING THE POLISHED GAP SURFACES, SAID SHIM HAVING A THICKNESS SLIGHTLY EXCEEDING THE DESIRED GAP WIDTH, HEATING THE RESULTANT ASSEMBLY TO A TEMPERATURE LYING IN THE SOFTENING RANGE OF THE GLASS AND COMPRESSING THE TWO CIRCUIT PARTS AGAINST THE GLASS SHIM AT A TEMPERATURE IN SAID SOFTENING RANGE UNTIL THE DESIRED GAP WIDTH IS ACHIEVED, SAID GLASS ACTING UPON HARDENING AS A GAP SPACER AND AS A BONDER FOR THE CIRCUIT PARTS.
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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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |