US3562444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording head assembly
Assignee: International Business Machines Corp
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Filing: 1968-02-29
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Granted: 1971-02-09
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Expires: 1988-02-29
Abstract
Abstract A recording head assembly includes a glass-gapped ferrite head bonded into a ceramic slider with a glass. Infrared bonding is employed. The infrared absorption properties of the glass are increased by the addition of cupric oxide.
Inventors
- 👤 Helen M Hoogendoorn
- 👤 Herbert E Liberman
- 👤 Bernt Narken
- 👤 Brian Sunners
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:47
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/105; G11B5/127; G11B5/1272; G11B5/133; G11B5/187; G11B5/23
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A ferrite head assembly including: a ferrite head having a pair of ferrite elements with a gap therebetween, said gap being filled with glass material which bonds said elements together; a ceramic slider provided with a slot; a low temperature sealing glass having lead oxide as a primary component in an approximate range of 50-80 percent by weight, mechanically joining and bonding said head to said slider within said slot; said sealing glass having a coefficient of thermal expansion near the coefficients of expansion of said head and slider, and said head being of reduced width in the region of said gap.
Claim 2
Dependent Claim
102 words
A ferrite head assembly including: a ferrite head having a pair of ferrite elements with a gap therebetween, said gap being filled with glass material which bonds said elements together; a ceramic slider provided with a slot; a low temperature sealing glass having lead oxide as a primary component in an approximate range of 50-80 percent by weight, mechanically joining and bonding said head to said slider within said slot; said sealing glass having a coefficient of thermal expansion near the coefficients of expansion of said head and slider, and said head being of reduced width in the region of said gap.
Claim 3
Dependent Claim
24 words
The invention defined by claim 1 wherein said sealing glass includes cupic oxide of less than 7 percent by weight concentration as a constituent.
References Cited (Backward Citations)
US3458926A
Cited
US3384954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |