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| Patents for Richard N. Clifton | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,458,597 | Jan. 11, 1949 | R.N. Clifton, W. Hoier | Milling Machine | milling machines | |
| 2,728,268 | Dec. 27, 1955 | P.F. Ochotschinsky, M.V. Waters, R.N. Clifton | Concavity Generating Milling Machine | milling machines | |
| 2,998,634 | Sep. 05, 1961 | R.N. Clifton, E.C. Raehrs | Broaching Tool | broaches | |
| 3,106,011 | Oct. 08, 1963 | D.O. Lawless, R.N. Clifton | Milling Cutter | milling machine cutters | |