Threading porcelain by gyrating the thread mandrel (""wobbler"" method)
Plunger to first form the pinhole in a porcelain insulator by first plunging a pinhole without threads then form the threads
| 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 = '264') AND (category.subclass = '319') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '264'; Subclass is '319';
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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 | |
| 1937 | ||||||
| U | 2,068,941 | January 26, 1937 | Process and Apparatus for Manufacturing Insulators Plunger to first form the pinhole in a porcelain insulator by first plunging a pinhole without threads then form the threads |
BOVARD, Floyd G. |
Press | The Ohio Brass Co. |
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