Patent information:
| Patent: | Utility 1,631,730 |
| Patented: | June 7, 1927 |
| Applied: | May 24, 1919 |
| Title: | Ceramic Material |
| Description: | Porcelain composition for spark plugs and insulators consisting of Sillimanite |
| Category: | Porcelain |
| Assigned to: | Champion Porcelain Co. |
Patentee Information:
Class and subclass information:
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 141 | CERAMIC COMPOSITIONS; Clay containing (e.g., porcelain, earthenware, etc.); |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 153 | CERAMIC COMPOSITIONS; Aluminum compound containing; |
Known specimens:
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