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| All Patents in class 118/638 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,027,308 | Jan. 07, 1936 | E.C. Schacht | Manufacture of abrasive articles | ||
| RE20,660 | Feb. 22, 1938 | E.C. Schacht | Method of coating and apparatus therefor and product | ||
| 2,245,301 | Jun. 10, 1941 | E.C. Schacht | Manufacture of abrasive articles | ||