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| Patents Granted on 1921-12-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,400,668 | Dec. 20, 1921 | E.R. Draver | Feeding device | ||
| 1,400,898 | Dec. 20, 1921 | A.G. Murdock | Hinge-Gage | butt gauges | |
| 1,400,993 | Dec. 20, 1921 | C.E. Sargent | Boiler Feed Water Purifier | feedwater apparatus | |
| 1,401,095 | Dec. 20, 1921 | J. Meinecke | Cane Sugar Mill | sugar cane apparatus | |