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| All Patents in class 30/452 | |||||
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| Number | Date | Patentee | Title | Type | |
| 18,265 | Sep. 22, 1857 | S. Darling, J.W. Strange | Pencil Sharpener | draftsman | |
| 116,276 | Jun. 27, 1871 | S. Darling | Pencil Sharpener | draftsman | |
| 174,777 | Mar. 14, 1876 | A.G. Buzby | Pencil Sharpener | pencil sharpeners | |
| 471,216 | Mar. 22, 1892 | T. Foy | Pencil Sharpener | pencil sharpeners | |
| 597,643 | Jan. 18, 1898 | W.F. Garrett | Pencil Sharpener | pencil sharpeners | |