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| Patents for Robert Schümann | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,031,133 | Feb. 18, 1936 | R. Schümann | Electric Hand Tool | handheld grinders | |
| 2,368,888 | Feb. 06, 1945 | R. Schümann | Small Electric Machine Tool | handheld grinders | |
| 2,377,271 | May 29, 1945 | R. Schümann | Flexible Shaft And Air-Cooled Hand Piece | handheld power tool accessories | |
| 2,452,268 | Oct. 26, 1948 | R. Schümann | Motor Hand Tool Assembly | handheld grinders | |