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| Patents Granted on 1980-04-22 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,198,790 | Apr. 22, 1980 | P. Gruber | Method for Finishing Spherical Rollers | profile and contour grinders | |
| 4,199,286 | Apr. 22, 1980 | E.E. Kirkham | Power Drawbolt With Planetary Drive | metalworking machine mechanisms | |
| 4,199,455 | Apr. 22, 1980 | M.R. Estabrook | Combined magnetic and cyclonic separating apparatus | ||