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| Patents for Richard J. Holmgreen | |||||
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| Number | Date | Patentee | Title | Type | |
| 422,053 | Feb. 25, 1890 | R.J. Holmgreen | Machine for turning broom-handles | wood lathes | |
| 1,502,633 | Jul. 22, 1924 | J.H. Holmgreen | Stop Mechanism for Bending Machines | sheet metal bending machines | |
| 1,679,825 | Aug. 07, 1928 | R.J. Holmgreen, J.H. Holmgreen | Rotary Well Drilling Machine | well drilling machines | |