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| Patents for O. B. Hopkins | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,001,206 | Aug. 22, 1911 | J.I. McCullough | Illuminated Spirit-Level | |
 | 1,001,278 | Aug. 22, 1911 | J.E. Kampe | Watchmaker's Poising Calipers | |
 | 1,016,296 | Feb. 06, 1912 | J.A. Schlehr | Bolt Holder | |