US Patent Class 501
COMPOSITIONS: CERAMIC-- Main Headings
 Electronic File Wrappers |  Electronic Patent Documents |  Paper Patent Documents | Current as of: June, 1999
|  and Services |
| Electronic File Wrappers | Electronic Patent Documents | Paper Patent Documents | Current as of: June, 1999
| and Services |
| CLASS NOTES | ||
| 1 | DF | CERAMIC COMPOSITIONS {15} |
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| CROSS-REFERENCE ART COLLECTIONS PERTAINING TO OPTICAL GLASSES IN SUBCLASSES 13, 40, 41+, AND 53+ | ||
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