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| Patents for Harold F. Skillings | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,599,374 | Sep. 07, 1926 | H.F. Skillings | Grinding Machine | surface grinders | |
| 1,767,321 | Jun. 24, 1930 | H.F. Skillings | Abrasive Wheel | grinder wheels | |
| 1,996,980 | Apr. 09, 1935 | H.F. Skillings | Rotary Abrading Tool | grinder wheels | |
| 2,751,722 | Jun. 26, 1956 | H.F. Skillings | Gauging Device For Surface Grinder | grinding attachments | |