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| Number | Title | Issue Date |
| 6405563 | Opaque silica glass article having transparent portion and process for producing same An opaque silica glass article comprising a transparent portion and an opaque portion, wherein the opaque portion has an apparent density of 1.70-2.15 g/cm3 and contains 5×104 -5×106 bubbles per cm3, said bubb... | 06/18/2002 |
| 6133178 | High purity transparent silica glass A high-purity transparent silica glass containing Fe, Na and K impurities each in an amount of 0.01-0.3 ppm, and an OH group in an amount of 0-3 ppm; among the Fe impurities, the content of metallic Fe having a valency of +0 being not larger than 0.1 ppm.... | 10/17/2000 |
