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| Patents Granted on 1970-12-15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,546,759 | Dec. 15, 1970 | F. Sirola | Cutting tool | lathe tool holders and tool posts | |
| 3,547,505 | Dec. 15, 1970 | D.E. Ott, A.W. Carlson | Biological service center | ||
| 3,547,800 | Dec. 15, 1970 | P. Pan | Apparatus and Method for Purifying Waste Waters | sewage treatment apparatus | |
| 3,548,255 | Dec. 15, 1970 | R.J. Kyp | Incandescent lamp with oscillating filament | incandescent light bulbs | |