| 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 = '221') ORDER BY date ASC, patent, type |
Total of 5 patents found where: Class is '221';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1920 | ||||||
| U | 1,342,053 | June 1, 1920 | Bushing Forming Machine Machine to manufacture wall tubes and bushings |
MCKNIGHT, Oscar W. |
Wall Tube | Brunt Tile & Porcelain Co. |
| 1923 | ||||||
| U | 1,471,907 | October 23, 1923 | Machine for Heading Porcelain Tubes and the Like Machine to make porcelain wall tubes |
MASON, Albert G. BUCKLEY, Lorenzo C. |
Wall Tube | The R. Thomas & Sons Co. |
| 1924 | ||||||
| U | 1,512,430 | October 21, 1924 | Machine for Assembling Nail Knobs Machine for assembling nail-knobs |
LOY, John G. |
Knob | Federal Porcelain Co. |
| 1926 | ||||||
| U | 1,589,939 | June 22, 1926 | Nail Knob Assembly Machine to manufacture nail-knobs |
CASE, Francis M. |
Knob | Federal Porcelain Co. |
| U | 1,589,940 | June 22, 1926 | Nail Knob Assembling and Securing Machine Machine to manufacture nail-knobs |
CASE, Francis M. |
Knob | Federal Porcelain Co. |
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