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 = '324.1') ORDER BY category DESC, date, patent, type |
Total of 4 patents found where: Class is '425'; Subclass is '324.1';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
Press | ||||||
U | 1,779,811 | October 28, 1930 | Method of Manufacturing Insulators Press for making skirts/petticoats in one-piece porcelain (replaces casting) |
HARVEY, William F. |
Press | |
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. |
Manufacturing | ||||||
U | 2,034,707 | March 24, 1936 | Apparatus for Making One-Piece Insulators Machine to press out the form and trim the profile in large unipart insulators |
BENARD, Arthur G. |
Manufacturing | Locke Insulator Corp. |
U | 2,395,295 | February 19, 1946 | Method of Producing Insulators Improved method of jiggering and plunging |
ROWLAND, Davidge H. |
Manufacturing |
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