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| Patents for Ralph W. E. Hopper | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 426,716 | Apr. 29, 1890 | E.S. Drake | Pencil-sharpener | |
 | 499,199 | Jun. 13, 1893 | J. Bath | Calipers | |
 | 520,201 | May 22, 1894 | J. Bath | Micrometer Indicator | |
 | 526,960 | Oct. 02, 1894 | J. Bath | Micrometer Indicator | |
 | 527,651 | Oct. 16, 1894 | J. Bath | Calipers | |