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| All Patents in class 76/87 | |||||
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| Number | Date | Patentee | Title | Type | |
| 97,090 | Nov. 23, 1869 | W.H. Howland | Improvement in knife-sharpener | sharpening apparatus | |
| 469,615 | Feb. 23, 1892 | S.W. Wardwell | Knife Sharpener | sharpening apparatus | |
| 575,351 | Jan. 19, 1897 | G.T. Hetzel | Sharpening Device | sharpening apparatus | |
| 1,259,408 | Mar. 12, 1918 | A. Johansen | Knife Sharpener | ||