| Patents for Frank H. Hopkins |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 900,371 | Oct. 06, 1908 | F.H. Hopkins | Differential Pressure Gage | vacuum and pressure gauges |
| 1,154,018 | Sep. 21, 1915 | F.H. Hopkins | Dead Weight Gage Tester | testing machines |
| 1,172,709 | Feb. 22, 1916 | F.H. Hopkins | Thermostatic Arch Flow Regulator | pressure regulators |
| 1,349,884 | Aug. 17, 1920 | F.H. Hopkins | Diaphragm Gage | vacuum and pressure gauges |
| 1,363,415 | Dec. 28, 1920 | F.H. Hopkins | Differential Pressure Gage | vacuum and pressure gauges |
| 1,404,770 | Jan. 31, 1922 | F.H. Hopkins | Air Brake Recording Apparatus | industrial recording apparatus |
| 1,404,771 | Jan. 31, 1922 | F.H. Hopkins | Compensating Thermometer | temperature gauges |
