US3767497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetic recorder head
Assignee: Individual
•
Filing: 1971-12-23
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Granted: 1973-10-23
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Expires: 1991-12-23
Abstract
Abstract A method of manufacturing a magnetic recorder head in which a glass frit layer is applied and preliminarily bonded to the front surfaces of a pair of ferromagnetic pieces forming the head, after which the pieces are pressed together at a predetermined pressure and at a temperature exceeding the softening temperature of the glass until an effective gap of a desired width is formed. An article manufactured according to this method.
Inventors
- 👤 A Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235; C; C03; C03C; C03C29/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A method of manufacturing a magnetic recorder head having at least one magnetic member and at least one effective gap formed between two adjacent surfaces of said member, said method comprising the steps of adhesively bonding a glass frit layer to one of said surfaces, heating said layer and said one surface to a temperature sufficient to burn off the adhesive and bond said glass to said one surface, allowing the assembly to cool so that said bonded glass establishes a preliminary gap width greater than the first gap width desired, and then pressing said surfaces together with said glass therebetween at a predetermined pressure and temperature exceeding the softening temperature of said glass until said final gap width is achieved.
Claim 2
Independent Claim
121 words
A method of manufacturing a magnetic recorder head having at least one magnetic member and at least one effective gap formed between two adjacent surfaces of said member, said method comprising the steps of adhesively bonding a glass frit layer to one of said surfaces, heating said layer and said one surface to a temperature sufficient to burn off the adhesive and bond said glass to said one surface, allowing the assembly to cool so that said bonded glass establishes a preliminary gap width greater than the first gap width desired, and then pressing said surfaces together with said glass therebetween at a predetermined pressure and temperature exceeding the softening temperature of said glass until said final gap width is achieved.
Claim 3
Independent Claim
124 words
A method of manufacturing a magnetic recorder head having at least one magnetic member and at least one effective gap formed between two adjacent surfaces of said member, said method comprising the steps of adhesively bonding a glass frit layer to both of said surfaces, heating said layer and said surfaces to a temperature sufficient to burn off the adhesive and bond said glass to said surfaces, allowing the assembly to cool so that said bonded glass on each surface establishes a preliminary gap width greater than one half the final gap width desired, and then pressing said surfaces together with said glass therebetween at a predetermined pressure and temperature exceeding the softening temperature of said glass until said final gap width is achieved.
Claim 4
Independent Claim
124 words
A method of manufacturing a magnetic recorder head having at least one magnetic member and at least one effective gap formed between two adjacent surfaces of said member, said method comprising the steps of adhesively bonding a glass frit layer to both of said surfaces, heating said layer and said surfaces to a temperature sufficient to burn off the adhesive and bond said glass to said surfaces, allowing the assembly to cool so that said bonded glass on each surface establishes a preliminary gap width greater than one half the final gap width desired, and then pressing said surfaces together with said glass therebetween at a predetermined pressure and temperature exceeding the softening temperature of said glass until said final gap width is achieved.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |