US3813252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered refractory material
Assignee: Elektroschmelzwerk Kempten GmbH
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Filing: 1969-10-27
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Granted: 1974-05-28
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Expires: 1989-10-27
Abstract
Abstract THE PRESENT INVENTION RELATES TO FORMED REFRACTORY ARTICLES OF INCREASED MACHINABILITY PREPARED BY INCLUDING 10-20%, BY WEIGHT, OF BORON NITRIDE IN REFRACTORIES COMPRISING A MIXTURE OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM NITRIDE, SILICON NITRIDE, AND ALUMINUM BORIDE AND AN ELECTRICALLY CONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF GRAPHITE, BORON CARBIDE TITANIUM CARBIDE, ZIRCONIUM CARBIDE, CHROMIUM CARBIDE, SILICON CARBIDE, TITANIUM BORIDE, ZIRCONIUM BORIDE AND CALCIUM MIUM BORIDE, SILICON BORIDE, BERYLLIUM BORIDE AND CALCIUM BORIDE.
Inventors
- 👤 A Lipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:43
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/584; C04B35/593
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |