| 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 = '444') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '425'; Subclass is '444';
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 |
| 1901 | ||||||
| U | 686,755 | November 19, 1901 | Machine for Making Insulating Tubes Automatic wall tube making machine. Likely assigned to the Akron Smoking Pipe Co. |
PALMER, Charles H. FENTON, Curtis |
Tube | |
| 1904 | ||||||
| U | 759,429 | May 10, 1904 | Machine for Heading Insulators Machine for forming the heads on pottery or porcelain wall tubes |
FIRESTONE, Truman L. |
Wall Tube | |
| 1923 | ||||||
| U | 1,469,584 | October 2, 1923 | Tube Forming Machine Machine for making porcelain wall tubes |
CASE, Francis M. |
Wall Tube | Federal Porcelain Co. |
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