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| Patents for Jacob Kettner | |||||
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| Number | Date | Patentee | Title | Type | |
| 252,436 | Jan. 17, 1882 | S. Darling | Metallic Try Square | try squares | |
| 287,420 | Oct. 30, 1883 | S. Darling | Micrometer | micrometers | |
| 289,512 | Dec. 04, 1883 | S. Darling | Graduated Measure of Length | rule graduations | |
| 289,513 | Dec. 04, 1883 | S. Darling | Micrometer Gage | micrometers | |
| 292,415 | Jan. 22, 1884 | S. Darling | Comparator | comparators | |
| 370,379 | Sep. 27, 1887 | S. Darling | Pen Cleaner | draftsman | |