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| All Patents in class 144/28.9 | |||||
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| Number | Date | Patentee | Title | Type | |
| 304,371 | Sep. 02, 1884 | E.S. Stimpson | Pencil-sharpener | pencil sharpeners | |
| 334,803 | Jan. 26, 1886 | G.H. Phelps | Pencil-sharpener | pencil sharpeners | |
| 547,151 | Oct. 01, 1895 | J.S. Moseley | Pencil-sharpener | ||
| 868,028 | Oct. 15, 1907 | C.C. Spengler | Pencil Sharpener | pencil sharpeners | |
| 889,056 | May 26, 1908 | C.C. Spengler | Pencil-sharpener | pencil sharpeners | |