| 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 = '411') AND (category.subclass = '520') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '411'; Subclass is '520';
View a patent by clicking on the patent number. You can sort by any of the columns by clicking on the column name.
| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1913 | ||||||
| U | 1,080,257 | December 2, 1913 | Insulator Wall tube with metal clip |
BRUCHSALER, Karl |
Wall Tube | |
| 1924 | ||||||
| U | 1,489,809 | April 8, 1924 | Insulator Suspension with ribbed sheet metal in pin and cap for better adhesion of cement |
AUSTIN, Arthur O. |
Suspension | The Ohio Brass Co. |
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