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| Patents for George A. Chapman | |||||
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| Number | Date | Patentee | Title | Type | |
| 259,903 | Jun. 20, 1882 | G.A. Chapman, J.H. Newbury | Device for Threading Plugs | metal lathe accessories and attachments | |
| 423,729 | Mar. 18, 1890 | J.H. Newbury, G.A. Chapman | Device for Cutting Screw Threads | metal threading machines | |
| 437,713 | Oct. 07, 1890 | G.A. Chapman, J.H. Newbury | Method of Cutting Screw Threads | pipe threading machines | |