| 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 = '385') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '425'; Subclass is '385';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1922 | ||||||
U  |
1,407,550 | February 21, 1922 | Method and Machine for Forming Impressions in Plastic Articles Threading porcelain by gyrating the thread mandrel (""wobbler"" method) |
LAPP, John |
Thread | |
| 1928 | ||||||
| U | 1,689,073 | October 23, 1928 | Indenting Tool Tool used to roll across the surface of a clay insulatot to form indentions or a rough surface to produce a better griping surface for cement. |
HARVEY, William F. |
Tool | |
| 1929 | ||||||
| U | 1,731,099 | October 8, 1929 | Method of Forming a Cement-Receiving Surface on an Insulator Section Improve cement adhesion by using a special roller tool to form a rough surface similar to that obtained by sanding. |
HARVEY, William F. |
Cement | |
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