| Patents for Frank S. Clarkson |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 194,221 | Aug. 14, 1877 | F.S. Clarkson | Improvement in cutter-heads for grooving and channeling | cutterheads |
| RE8,586 | Feb. 18, 1879 | E.H. Clarkson, W.H. Kesler | Improvement in sash-cord guides | |
| 216,767 | Jun. 24, 1879 | F.S. Clarkson, F.B. Sloan | Improvement in sash-cord guides | door and window hardware |
| RE9,221 | Jun. 01, 1880 | E.H. Clarkson | Mortising-machine | mortising machines |
| 249,306 | Nov. 08, 1881 | F.S. Clarkson | Mortising-machine | mortising machines |
| 827,618 | Jul. 31, 1906 | F.S. Clarkson | Sash-pulley | |
