US3819348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified method for bonding ferrite cores
Assignee: Potter Instrument Co Inc
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Filing: 1971-07-26
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Granted: 1974-06-25
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Expires: 1991-07-26
Abstract
Abstract In a method for manufacturing glass-bonded ferrite-core magnetic transducers, cavities formed between a pair of ferrite blocks are evacuated in order to clamp the blocks together and to insure that the glass flows adequately into gaps to be bonded.
Inventors
- 👤 J Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:01
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/50; C04B2237/76; C04B2237/80; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
Method of manufacturing magnetic transducer with a narrow transducing gap including the steps of: positioning two pieces of core material in a facing relationship, said two pieces so shaped as to form two chambers between said pieces of core material and separated by a wall with a narrow gap therein; placing a solid charge of bonding material in one of said chambers; pneumatically sealing said chambers; creating pressure in said chambers lower than that of the atmosphere surrounding said two pieces of core material to clamp together said pieces of core material; and heating said clamped together pieces of core material to a temperature which causes said material to flow into said gap.
Claim 2
Dependent Claim
113 words
Method of manufacturing magnetic transducer with a narrow transducing gap including the steps of: positioning two pieces of core material in a facing relationship, said two pieces so shaped as to form two chambers between said pieces of core material and separated by a wall with a narrow gap therein; placing a solid charge of bonding material in one of said chambers; pneumatically sealing said chambers; creating pressure in said chambers lower than that of the atmosphere surrounding said two pieces of core material to clamp together said pieces of core material; and heating said clamped together pieces of core material to a temperature which causes said material to flow into said gap.
Claim 3
Dependent Claim
54 words
A method, as in claim 1, of manufacturing a magnetic transducer with a narrow transducing gap including the further step of maintaining an increased pressure in the chamber in which the bonding material is placed relative to the pressure in the other chamber to assist the flow of bonding material in the said gap.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |