| 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 = '268') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '425'; Subclass is '268';
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 |
| 1922 | ||||||
| U | 1,427,213 | August 29, 1922 | Lathe Lathe to cut insulator profile using a profile template |
LAPP, John S. |
Lathe | Lapp Insulator Co. |
| 1923 | ||||||
| U | 1,465,157 | August 14, 1923 | Apparatus for Shaping Insulators Machine to shape to crown of a small pin-type insulator |
BUCKLEY, Lorenzo C. |
Machine | The R. Thomas & Sons Co. |
| 1930 | ||||||
| U | 1,755,308 | April 22, 1930 | Apparatus for Finishing Insulator Shells Machine to form grooves inside the suspension disk to aid cement adhesion. |
SMITH, William Henry |
Suspension | Electric Service Supplies Co. |
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