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| Patents Granted on 1971-12-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,629,910 | Dec. 28, 1971 | C.C. Hsiao, R.C. Kirberg | Handle Assembly for Picture Projection Screen | audio-visual apparatus | |
| 3,630,244 | Dec. 28, 1971 | T.E. Clyce, J.Y. Cromeens | Saw apparatus with laterally adjustable saws | circular saws | |
| 3,630,359 | Dec. 28, 1971 | H.M. Harper, P. Pan | Multiple-Drum Interceptor | sewage treatment apparatus | |