| All Patents in class 144/28.8 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 89,109 | Apr. 20, 1869 | S.S. Woodcock | Improvement in pencil-sharpeners | pencil sharpeners |
| 203,550 | May 14, 1878 | F. Livingston | Improvement in machines for sharpening pencils | pencil sharpeners |
| 291,235 | Jan. 01, 1884 | W.E. Sibley | Pencil-sharpener | |
| 342,350 | May 25, 1886 | F.H. Cook, C.E. Gould | Pencil-sharpener | pencil sharpeners |
| 438,569 | Oct. 14, 1890 | W. Rundquist, L.N. Jackman | Machine for sharpening pencils | pencil sharpeners |
| 441,016 | Nov. 18, 1890 | A.J. Mundy | Pencil-sharpener | pencil sharpeners |
| 448,723 | Mar. 24, 1891 | J.D. Mills | Pencil-sharpener | pencil sharpeners |
| 459,180 | Sep. 08, 1891 | G.C. McDermott, J.D. Mills | Pencil-sharpener | pencil sharpeners |
| 554,608 | Feb. 11, 1896 | C.M. Walker | Pencil-sharpener | pencil sharpeners |
| 575,964 | Jan. 26, 1897 | P.L. Lord | Combined pencil-sharpener and eraser-cleaner | pencil sharpeners |
| 593,093 | Nov. 02, 1897 | H.A. Guhl | Apparatus for Sharpening Pencils | pencil sharpeners |
| 832,054 | Oct. 02, 1906 | E.N. Gilfillan | Pencil-sharpener | pencil sharpeners |
| 1,330,105 | Feb. 10, 1920 | W.A. Whitney | Pencil Sharpener | pencil sharpeners |
