| 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 = '324') AND (category.subclass = '552') ORDER BY date ASC, patent, type |
Total of 4 patents found where: Class is '324'; Subclass is '552';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1924 | ||||||
| U | 1,515,864 | November 18, 1924 | Method of Testing Insulators Testing method by extending the flashover distance |
LAPP, Grover W. |
Testing | |
| 1930 | ||||||
| U | 1,750,699 | March 18, 1930 | Process and Apparatus for Testing Insulators Apparatus to run a high voltage test on insulators (see 1,796,427) |
AUSTIN, Arthur O. |
Manufacturing | The Ohio Brass Co. |
| 1931 | ||||||
| U | 1,796,427 | March 17, 1931 | Process and Apparatus for Testing Insulators Apparatus to run a high voltage test on insulators (see 1,750,699 and 1,796,427) |
AUSTIN, Arthur O. |
Manufacturing | The Ohio Brass Co. |
| U | 1,796,429 | March 17, 1931 | Apparatus for Testing Insulators Apparatus to run a high voltage test on insulators (see 1,796,427) |
AUSTIN, Arthur O. |
Manufacturing | The Ohio Brass Co. |
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