Claims
- 1. A glass-ceramic article having a crystal content in excess of about 50% by volume, the composition of the article consisting essentially, by weight, of about 55-70%, SiO.sub.2, 20-30% Al.sub.2 O.sub.3, and 3.5-15% N, wherein the predominant crystal phase consists of "nitrogen-mullite" solid solution.
Parent Case Info
This is a division of co-pending application Ser. No. 843,872, filed Oct. 20, 1977, which is a division of Ser. No. 735,313, filed Oct. 26, 1976, now U.S. Pat. No. 4,070,198, issued Jan. 24, 1978, which in turn is a continuation-in-part of Ser. No. 664,263, filed Mar. 5, 1976, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2,034,011 |
Jan 1972 |
DEX |
Divisions (2)
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Number |
Date |
Country |
Parent |
843872 |
Oct 1977 |
|
Parent |
735313 |
Oct 1976 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
664263 |
Mar 1976 |
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