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 = '425') AND (category.subclass = '421') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '425'; Subclass is '421';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1930 | ||||||
U | 1,784,792 | December 9, 1930 | Apparatus for Making Insulators Manufacturing method that replace casting large unipart insulators with a means to press out the entire form of the insulator |
HAWLEY, Kent A. |
Manufacturing | Locke Insulator Corp. |
1934 | ||||||
U | 1,978,627 | October 30, 1934 | Vibrating Plunging Machine Manufacturing method using a vibrating plunger tool to form the underside shape of the insulator without causing stresses in the finished porcelain |
GOUVERNEUR, Minor F. H. |
Manufacturing | Locke Insulator Corp. |
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