Patent information:
| Patent: | Utility 2,327,972 |
| Patented: | August 24, 1943 |
| Applied: | January 17, 1939 |
| Title: | High Strength Ceramic Surface |
| Description: | Manufacturing method of 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 2,337,691) |
| Category: | Manufacturing |
| Assigned to: | Lapp Insulator Co., Inc. |
Patentee Information:
Class and subclass information:
| Class: | 428 | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
| Subclass: | 149 | STRUCTURALLY DEFINED WEB OR SHEET (E.G., OVERALL DIMENSION, ETC.); Continuous and nonuniform or irregular surface on layer or component (e.g., roofing, etc.); Particulate matter; Silicon containing; |
| Class: | 174 | ELECTRICITY: CONDUCTORS AND INSULATORS |
| Subclass: | 137A | INSULATORS; Coated; |
| Class: | 174 | ELECTRICITY: CONDUCTORS AND INSULATORS |
| Subclass: | 137R | INSULATORS; |
| Class: | 428 | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
| Subclass: | 446 | COMPOSITE (NONSTRUCTURAL LAMINATE); Of silicon containing (not as silicon alloy); |
Known specimens:
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