| All Patents in class 451/421 |
Patents 1 -
15
of 17
      |
| Number | Date | Patentee | Title | Type |
| 75,411 | Mar. 10, 1868 | J. Grant | Improvement in grinder for knives for planers | sharpening machines |
| 129,548 | Jul. 16, 1872 | J.J. Grant | Improvement in devices for grinding rotary cutters | cutter grinding |
| 161,726 | Apr. 06, 1875 | G.E. Woodbury | Improvement in planing-machines | wood planers |
| 267,579 | Nov. 14, 1882 | M.W. Palmer | Planer-knife grinder | cutter grinding |
| 856,726 | Jun. 11, 1907 | H.B. Ross | Cutter-head-knife sharpener | woodworking machine sharpening mechanisms |
| 983,850 | Feb. 07, 1911 | L.B. Whipple | Knife-grinding attachment for planing-machines | wood planers |
| 990,373 | Apr. 25, 1911 | H.J. Mitchell | Planer-knife sharpener | woodworking machine sharpening mechanisms |
| 1,038,500 | Sep. 10, 1912 | J.F. Tracy, H.B. Foley | Portable grinding device for sharpening knives of jointing or planing machines | sharpening machines |
| 1,160,784 | Nov. 16, 1915 | F. Stutzman | Grinding-machine | sharpening machines |
| 1,438,991 | Dec. 19, 1922 | W.R. Fox, H.D. Corwin | Pipe cutter | pipe cutting machines |
| 1,552,001 | Sep. 01, 1925 | L.T. Medholdt, L.B. Carlson | Cutter-grinding device | cutter grinding |
| 1,651,013 | Nov. 29, 1927 | W.R. Buss, H.N. Buss | Motor-driven planer | |
| 1,874,331 | Aug. 30, 1932 | L.T. Medholdt | Knife grinder support for woodworking machines | wood planers |
| 2,792,036 | May 14, 1957 | R.A. Buttke | Planer and attachments therefor | wood planers |
| 2,944,376 | Jul. 12, 1960 | R.A. Buttke | Grinder attachment for woodworking machines | woodworking machine sharpening mechanisms |
