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| Patents Granted on 1990-08-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,949,576 | Aug. 21, 1990 | F.D. Floyd | Self-adjusting Lid Wrench | jar wrenches | |
| 4,949,943 | Aug. 21, 1990 | L.M. Bernstein | Multiple air cylinder clamp for vise | machinist vises | |
| 4,950,392 | Aug. 21, 1990 | M.D. Tiegs, R.D. Liegel | Filtration tank for filtering waste water used in washing mechanical components | ||