US4147911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for sintering refractories and an apparatus therefor
Assignee: Nippon Steel Corp
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Filing: 1976-08-10
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Granted: 1979-04-03
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Expires: 1996-08-10
Abstract
Abstract A method for sintering refractories comprising adding 0.05 to 10% by weight of an electro-conductive particles to a group of dielectric refractory particles to obtain a mixture thereof, and heating the mixture by means of microwave induction heating to sinter the refractions.
Inventors
- 👤 Teruyuki Nishitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; H; H05; H05B; H05B6/00; H05B6/64; H05B6/80; H05B2206/00; H05B2206/04; H05B2206/046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A method for sintering refractories which comprises mixing a group of dielectric refractory particles with 0.1 to 5% by weight of an electric conductor, in which the particle size of the electric conductor is not more than 10 times the skin depth of the conductor in the microwave region, forming the mixture and sintering the formed mixture thus obtained by means of microwave induction heating in a space surrounded by a metal wall.
Claim 2
Independent Claim
73 words
A method for sintering refractories which comprises mixing a group of dielectric refractory particles with 0.1 to 5% by weight of an electric conductor, in which the particle size of the electric conductor is not more than 10 times the skin depth of the conductor in the microwave region, forming the mixture and sintering the formed mixture thus obtained by means of microwave induction heating in a space surrounded by a metal wall.
Claim 3
Dependent Claim
44 words
A method for sintering refractories according to claim 1 in which said electric conductor comprises particles selected from the group consisting of metal and non-metal particles having a specific electric conductivity of not less than 10 -3 Ω -1 cm -1 at higher temperatures.
Claim 4
Dependent Claim
23 words
A method for sintering refractories according to claim 1 in which a solid oxidant is added when said electric conductor comprises metal particles.
References Cited (Backward Citations)
US1868091A
Cited
US4057702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |