US4438213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head slider material and method for producing the same
Assignee: Nippon Tungsten Co Ltd
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Filing: 1982-08-31
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Granted: 1984-03-20
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Expires: 2002-08-31
Abstract
Abstract Magnetic head slider material consisting of 5 DIFFERENCE 10 percent by weight of silicon, 1.3 DIFFERENCE 7.8 percent by weight of tungsten silicide and essentially balanced silicon carbide. And it is method for producing said magnetic head slider material that at the time of which the mixed powder consisting of silicon carbide, carbon and tungsten is sintered, cellulose is also mixed with said mixed powder and sintered together at the same time. And then fibrous micropores are caused to the sintered body by the above-described sintering, after that molten metallic silicon infiltrated into fibrous micropores.
Inventors
- 👤 Mitsuhiki Furukawa
- 👤 Michito Miyahara
- 👤 Takashi Kitahira
- 👤 Kiyohito Misumi
- 👤 Masaharu Shiroyama
- 👤 Toshiaki Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; G11B5/127; G11B5/31; G11B5/3103; G11B5/3106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
Magnetic head slider material consisting of 5˜10 percent by weight of silicon, 1.3˜7.8 percent by weight of tungsten silicide and the balance being silicon carbide.
Claim 2
Dependent Claim
25 words
Magnetic head slider material consisting of 5˜10 percent by weight of silicon, 1.3˜7.8 percent by weight of tungsten silicide and the balance being silicon carbide.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |