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| Patents for Thor H. Ljunggren | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,503,674 | Apr. 11, 1950 | T.H. Ljunggren | Grinding machine drive | grinders | |
| 2,585,533 | Feb. 12, 1952 | W.J. Bryant, T.H. Ljunggren, W.F. Moore | Internal grinding machine with automatic air gauge sizing | cylindrical grinders | |
| 2,590,151 | Mar. 25, 1952 | W.J. Bryant, H.H. Gates, T.H. Ljunggren | Bore gauge head | grinding attachments | |
| 2,622,939 | Dec. 23, 1952 | T.H. Ljunggren | Carriage mounting | grinders | |