| 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 = '423') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '425'; Subclass is '423';
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 |
| 1925 | ||||||
| U | 1,556,440 | October 6, 1925 | Press for Making Insulators and the Like Press for forming threads in porcelain insulators and to prevent damaging the threaded pinhole once formed |
HIBBARD, Robert L. |
Press | |
| 1927 | ||||||
| U | 1,625,514 | April 19, 1927 | Apparatus for Forming Plastic Materials Improved press to form insulator shape from wet process clay and cut in threaded pinhole |
AUSTIN, Arthur O. MACLEOD, Donald Keith |
Press | The Ohio Brass co. |
| 1928 | ||||||
| U | 1,663,329 | March 20, 1928 | Forming and Tapping Machine Machine to form threads in plastic clay bodies |
AUSTIN, Arthur O. |
Manufacturing | The Ohio Brass Co. |
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