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| Patents for R. J. Jacker | |||||
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| Number | Date | Patentee | Title | Type | |
| 552,659 | Jan. 07, 1896 | A.B. Brown | Micrometer Calipers | micrometers | |
| 575,661 | Jan. 19, 1897 | W.F. Trotter | Gas or Oil Engine | gas and gasoline engines | |
| 624,149 | May 02, 1899 | A.H. Anderson | Wrench | quick adjust wrenches | |
| 740,571 | Oct. 06, 1903 | G. Joranson | Gas Engine | internal combustion engine valves | |
| 779,392 | Jan. 03, 1905 | O. Bjordal | Cammed Cutter Adjustment | plane cutter adjustments | |
| 1,019,400 | Mar. 05, 1912 | V. Langsdon, L.W. Zuegner | Universal Test Indicator | test indicators | |