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| Patents for Herbert H. Lewis | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,934,611 | Jun. 19, 1990 | H.H. Lewis | Rotary grinding apparatus | wood grinding machines | |
| 4,934,614 | Jun. 19, 1990 | H.H. Lewis | Rotary grinding apparatus with secondary grinding chamber section | wood grinding machines | |
| 4,946,109 | Aug. 07, 1990 | H.H. Lewis | Tooth assembly for rotary grinding apparatus | wood grinding machines | |