| Patents for R. T. Campbell |
Patents 1 -
15
of 29
      |
| Number | Date | Patentee | Title | Type |
| RE374 | Jul. 01, 1856 | S.J. Sherman | Pocket Level | levels |
| 18,560 | Nov. 03, 1857 | T.R. Timby | Barometer | |
| 27,782 | Apr. 10, 1860 | L. Eames | Mortising-tool | mortise chisels |
| 27,895 | Apr. 17, 1860 | L. Eames | Mortising-machine | mortising machines |
| 39,182 | Jul. 07, 1863 | I. Straub | Improvement in sugar-cane-crushing mills | sugar refining apparatus |
| 40,650 | Nov. 17, 1863 | I. Straub, A. Straub | Improved artificial variegated marble | |
| 40,651 | Nov. 17, 1863 | I. Straub, A. Straub | Improved asphaltic paving or flag stone | |
| 41,396 | Jan. 26, 1864 | J. Richards | Improvement in in Trying-Squares | try squares |
| 43,386 | Jul. 05, 1864 | W.H. Barney | Rest for Turning Lathes | metal lathe accessories and attachments |
| 46,261 | Feb. 07, 1865 | S. Pennock | Edging Sheet-Metal | sheet metal |
| 46,391 | Feb. 14, 1865 | J. Richards | Improvement in machines for mortising plane-stocks | tool making machines |
| 46,392 | Feb. 14, 1865 | J. Richards | Improvement in machines for mortising plane-stocks | mortising machines |
| 49,634 | Aug. 29, 1865 | C.C. Kroh | Improvement in Curtain-Knobs | auxiliary wrenches |
| 59,792 | Nov. 20, 1866 | D. Drawbaugh | Improvement in faucets | |
| 59,793 | Nov. 20, 1866 | D. Drawbaugh | Improvement in faucets | |
