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| Patents for Ralph W. E. Hopper | |||||
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| Number | Date | Patentee | Title | Type | |
| 499,199 | Jun. 13, 1893 | J. Bath | Calipers | measurement gauges | |
| 520,201 | May 22, 1894 | J. Bath | Micrometer Indicator | test indicators | |
| 526,960 | Oct. 02, 1894 | J. Bath | Micrometer Indicator | test indicators | |
| 527,651 | Oct. 16, 1894 | J. Bath | Calipers | measurement gauges | |