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| Patents for Curtis & Curtis | |||||
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| Picture | Number | Date | Patentee | Title | |
| 437,291 | Sep. 30, 1890 | R.P. Curtis | Machine for Simultaneously Threading a Plurality of Bolts | ||
| 439,122 | Oct. 28, 1890 | L.B. Curtis | Pipe and Bolt Threading Attachment for Lathes | ||
| 443,500 | Dec. 30, 1890 | L.B. Curtis, R.P. Curtis | Pipe Threading Machine | ||
| 443,501 | Dec. 30, 1890 | R.P. Curtis | Pipe Threading Machine | ||
| 443,502 | Dec. 30, 1890 | R.P. Curtis | Pipe Threading Machine | ||
| 465,838 | Dec. 29, 1891 | L.B. Curtis | Pipe Threading Attachment for Lathes | ||