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| All Patents in class 144/28.8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 291,235 | Jan. 01, 1884 | W.E. Sibley | Pencil-sharpener | ||
| 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 | |