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| Patents for Ormerod, Grierson & Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 20,894 | Jul. 13, 1858 | C.T. Porter | Governor for steam-engines | |
 | RE740 | Jun. 21, 1859 | C.T. Porter | Improvement in governors for steam-engines | |
 | 32,583 | Jun. 18, 1861 | C.T. Porter | Marine governor | |
 | GB-189,407,140 | Feb. 28, 1895 | C.T. Porter | Improvements in steam-engines, and in cylinders, governors, and valve motions therefor, and in provisions for lubricating the same | |