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| Patents for Bausch & Lomb Optical Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 587,637 | Aug. 03, 1897 | E. Bausch | Prism gage | |
| 1,283,884 | Nov. 05, 1918 | G.A. Kellner, W.L. Patterson | Microscope | ||
| 1,532,297 | Apr. 07, 1925 | E. Hart, C.L. Bausch | Calipers | ||
| 1,686,318 | Oct. 02, 1928 | G.B. Gallasch | Gauge | ||