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| Patents for Charles A. Spring | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,249 | Apr. 03, 1849 | W.H. Derick, C.A. Spring | Planing machine | wood planers | |
| 7,536 | Jul. 30, 1850 | P. Boon, C.A. Spring | Arrangement of pressure and feed rollers in planing-machines | wood planers | |
| RE209 | Jan. 13, 1852 | C.A. Spring, P. Boon | Planing machine, head at angle to feed | wood planers | |