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| Patents for Lewis R. Heim | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,733,089 | Oct. 22, 1929 | L.R. Heim | Grinding | grinding machines | |
| 1,741,236 | Dec. 31, 1929 | L.R. Heim | Grinding | grinding machines | |
| 1,772,544 | Aug. 12, 1930 | L.R. Heim | Truing Device for Abrasive Wheels Used in Producing Ground Articles | grinding machines | |