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| Patents for Fred A. Welles | |||||
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| Number | Date | Patentee | Title | Type | |
| 402,876 | May 07, 1889 | F.A. Welles | Calipers or Dividers | calipers | |
| 428,191 | May 20, 1890 | T.H. Harrison, F.A. Welles | Beam Compass | compasses | |
| 444,865 | Jan. 20, 1891 | F.A. Welles | Surface Gage | surface gauges | |