| SELECT DISTINCT patent.*, YEAR(date) as year FROM patent WHERE (category = 'Plunger') ORDER BY date ASC, patent, type |
Total of 7 patents found where: Category is 'Plunger';
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 |
| 1872 | ||||||
U  |
132,214 | October 15, 1872 | Improvement in Formers for Segmentally Screw Threaded Insulators Plunger to form segmented threads |
OAKMAN, Samuel |
Plunger | |
| U |
132,215 | October 15, 1872 | Improvement in Formers for Segmentally Screw Threaded Insulators Plunger to form segmented threads |
OAKMAN, Samuel |
Plunger | |
| 1879 | ||||||
| U | 215,516 | May 20, 1879 | Improvement in Devices for Attaching Plungers to Glass Presses Means of attaching a plunger to a glass press using a chuck. (This is known as the ""Gill Chuck"" and may have been used in insulator production, it is not known if Gill was employed by Hemingray at the time of this patent.) |
GILL, James G. |
Plunger | |
| 1903 | ||||||
| U | 735,429 | August 4, 1903 | Insulator Machine Plunger for press |
WATERS, James |
Plunger | |
| 1909 | ||||||
| U |
913,212 | February 23, 1909 | Insulator Mold Plunger for press formed segmented threads in pinhole |
JOHNSON, Chauncey C. |
Plunger | 9/20 to John Watson |
| 1915 | ||||||
| U | 1,157,612 | October 19, 1915 | Die for Insulators Plunger to form suspension petticoats and threaded pinhole |
BENNETT, Cornelius Van Dyke |
Plunger | Locke Insulator Mfg. Co. |
| 1916 | ||||||
| U | 1,198,732 | September 19, 1916 | Plunger for Forming Insulators Plunger with holes to release pressure (see 838,727 and reissue 12,934) |
LOCKE, Louis Peer |
Plunger | Locke Insulator Mfg. Co. |
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