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| Patents Granted on 1970-01-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,490,834 | Jan. 20, 1970 | W.H. Trow | Projector for Selectively Showing Slides or Film Strips | projectors | |
| 3,491,277 | Jan. 20, 1970 | W.E. Brainard | Thermal Compensation System for Position Transducers | metalworking machine mechanisms | |
| 3,491,278 | Jan. 20, 1970 | R.E. Stobbe | Preset Dimension Compensator for a Numerical Control System | metalworking machine mechanisms | |