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| Patents for Knut R. Sjogren | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,789,601 | Jan. 20, 1931 | K.R. Sjogren | Chuck | metal lathe chucks | |
| 2,293,176 | Aug. 18, 1942 | K.R. Sjogren | Collet chuck construction | metal lathe chucks | |
| 2,311,258 | Feb. 16, 1943 | K.R. Sjogren | Collet chuck | metal lathe chucks | |