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| Patents Granted on 1845-12-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,317 | Dec. 20, 1845 | J. Ericsson | Compound Steam Engine | steam engines | |
| 4,319 | Dec. 20, 1845 | J. Ball | Machinery for riveting pipes | riveting machines | |
| 4,321 | Dec. 20, 1845 | C.B. Rogers | Machinery for dressing combs | comb making machines | |