| Patents for D. L. Johnston |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 109,546 | Nov. 22, 1870 | J.W. Paige, D. Reynolds | Improvement in the manufacture of salt | |
| 115,029 | May 23, 1871 | D. Copeland, Jr. | Improvement in cement-pipe | |
| 115,030 | May 23, 1871 | D. Copeland, Jr. | Improvement in machines for molding drain and sewer pipes | |
| 120,103 | Oct. 17, 1871 | L. Runyon | Improvement in churns | churns |
| 120,195 | Oct. 24, 1871 | E.W. Herendeen | Improvement in harrows | harrows |
| 121,936 | Dec. 19, 1871 | G.W. Fisher | Improvement in toy monuments | |
| 145,942 | Dec. 30, 1873 | J. Greenwood | Improvement in machines for forcing hoops on barrels | cooper |
