| SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '501') AND (category.subclass = '140') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '501'; Subclass is '140';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1867 | ||||||
| U | 61,390 | January 22, 1867 | Improved Compound for Telegraph Insulators, and for Other Purposes Heating earthenware insulators to 400-500 degrees and dipping into asphaltic compound that has been mixed with sulfur, silicic acid, and silicate of alumina to provide a hard, weather-resistant coating |
BOYNTON, John F. |
Coating | |
| 1870 | ||||||
| U | 103,122 | May 17, 1870 | Improvement in Insulators for Telegraphic Wire Hook with metallic oxide cement to hold hook or pin |
BAKER, Robert B. |
Hook | |
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