Patent information:
| Patent: | Utility 2,337,691 |
| Patented: | December 28, 1943 |
| Applied: | April 29, 1942 |
| Title: | Method of Making High Strength Ceramic Surfaces |
| Description: | Method of manufacturing insulators using porcelain ""sand"" with a lower coefficient of expansion than the insulator body to rough up the surface and provide a strong cement joint without reducing the effectiveness of the compression glaze (see 2,327,972) |
| Category: | Manufacturing |
| Assigned to: | Lapp Insulator Co., Inc. |
Patentee Information:
Class and subclass information:
| Class: | 427 | COATING PROCESSES |
| Subclass: | 193 | SOLID PARTICLES OR FIBERS APPLIED; Uniting particles to form continuous coating with nondiscernible particles; Vitrifiable particles; |
| Class: | 174 | ELECTRICITY: CONDUCTORS AND INSULATORS |
| Subclass: | 137A | INSULATORS; Coated; |
| Class: | 174 | ELECTRICITY: CONDUCTORS AND INSULATORS |
| Subclass: | 137R | INSULATORS; |
| Class: | 501 | COMPOSITIONS: CERAMIC |
| Subclass: | 141 | CERAMIC COMPOSITIONS; Clay containing (e.g., porcelain, earthenware, etc.); |
Known specimens:
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