| Patents for Curtis & Curtis |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 437,291 | Sep. 30, 1890 | R.P. Curtis | Machine for Simultaneously Threading a Plurality of Bolts | metal threading machines |
| 439,122 | Oct. 28, 1890 | L.B. Curtis | Pipe and Bolt Threading Attachment for Lathes | metal lathe accessories and attachments |
| 443,500 | Dec. 30, 1890 | L.B. Curtis, R.P. Curtis | Pipe Threading Machine | pipe threading machines |
| 443,501 | Dec. 30, 1890 | R.P. Curtis | Pipe Threading Machine | pipe threading machines |
| 443,502 | Dec. 30, 1890 | R.P. Curtis | Pipe Threading Machine | pipe threading machines |
| 465,838 | Dec. 29, 1891 | L.B. Curtis | Pipe Threading Attachment for Lathes | metal lathe accessories and attachments |
