Patent US3854967A successfully refreshed from Google Patents.
US3854967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature- and corrosion-resistant material
Assignee: Elektroschmelzwerk Kempten GmbH
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Filing: 1973-06-27
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Granted: 1974-12-17
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Expires: 1993-06-27
Abstract
Abstract The present invention relates to refractory, corrosion-resistant materials, suitable for the production of crucibles and the like, produced by compressing at elevated temperatures and pressures mixtures comprising 10-16 percent, by weight, of aluminum nitride and 90-40 percent, by weight, of boron nitride containing 5-25 percent, by weight, of boron oxide.
Inventors
- 👤 K Reinmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/581
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
PROCESS FOR THE PRODUCTION OF REFRACTORY CORROSIONRESISTANT ARTICLES WHICH COMPRISES COMPRESSING AT TEMPERATURES OF THE ORDER OF 1,500*-2,200*C AND PRESSURE OF THE ORDER OF 30-200 KG/CM2 A MIXTURE OF 10-60 PERCENT, BY WEIGHT, OF ALUMINUM NITRIDE AND 90-40 PERCENT, BY WEIGHT OF BBORON NITRIDE CONTAINING 5-25 PERCENT, BY WEIGHT, OF BORON OXIDE.
Claim 2
Dependent Claim
52 words
PROCESS FOR THE PRODUCTION OF REFRACTORY CORROSIONRESISTANT ARTICLES WHICH COMPRISES COMPRESSING AT TEMPERATURES OF THE ORDER OF 1,500*-2,200*C AND PRESSURE OF THE ORDER OF 30-200 KG/CM2 A MIXTURE OF 10-60 PERCENT, BY WEIGHT, OF ALUMINUM NITRIDE AND 90-40 PERCENT, BY WEIGHT OF BBORON NITRIDE CONTAINING 5-25 PERCENT, BY WEIGHT, OF BORON OXIDE.
Claim 3
Dependent Claim
66 words
Process for the production of refractory, corrosion-resistant articles which comprises compressing, at temperatures of the order of 1,500*-2,200*C and pressures of the order of 30-200 kg/cm2, 10-60 percent, by weight of aluminum nitride with 90-40 percent, by weight, of boron nitride containing 5-25 percent, by weight, of boron oxide, at least two mols of aluminum nitride per mol of boron oxide being present in said mixture.
Claim 4
Dependent Claim
66 words
Process for the production of refractory, corrosion-resistant articles which comprises compressing, at temperatures of the order of 1,500*-2,200*C and pressures of the order of 30-200 kg/cm2, 10-60 percent, by weight of aluminum nitride with 90-40 percent, by weight, of boron nitride containing 5-25 percent, by weight, of boron oxide, at least two mols of aluminum nitride per mol of boron oxide being present in said mixture.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |