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| Patents for Corneil Ridderhof | |||||
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| Picture | Number | Date | Patentee | Title | |
| 691,488 | Jan. 21, 1902 | C. Ridderhof | Friction-clutch for counter-shafts | ||
| 702,885 | Jun. 17, 1902 | C. Ridderhof | Drill-grinding machine | ||
| 743,033 | Nov. 03, 1903 | C. Ridderhof | Drill-grinding machine | ||
| 772,908 | Oct. 18, 1904 | G.E. Miles, C. Ridderhof | Flashing device for incandescent electric lamps | ||
| 829,488 | Aug. 28, 1906 | C. Ridderhof | Mandrel-press | ||