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| Patents for Frank H. Hopkins | |||||
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| Picture | Number | Date | Patentee | Title | |
| 900,371 | Oct. 06, 1908 | F.H. Hopkins | Differential Pressure Gage | ||
| 1,154,018 | Sep. 21, 1915 | F.H. Hopkins | Dead Weight Gage Tester | ||
| 1,172,709 | Feb. 22, 1916 | F.H. Hopkins | Thermostatic Arch Flow Regulator | ||
| 1,349,884 | Aug. 17, 1920 | F.H. Hopkins | Diaphragm Gage | ||
| 1,363,415 | Dec. 28, 1920 | F.H. Hopkins | Differential Pressure Gage | ||
| 1,404,770 | Jan. 31, 1922 | F.H. Hopkins | Air Brake Recording Apparatus | ||
| 1,404,771 | Jan. 31, 1922 | F.H. Hopkins | Compensating Thermometer | ||