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| Patents Granted on 1981-01-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,242,926 | Jan. 06, 1981 | N.T. Anton | Device for sharpening saw chains | chainsaw sharpeners | |
| GB-2,051,630 | Jan. 21, 1981 | J. Harman | Indexing Mechanism for a Machine Tool | indexers and dividers | |
| 4,246,811 | Jan. 27, 1981 | F.L. Heim, J.R. Bondhus | Ball head polygonal wrench | wrenches | |
| 4,246,943 | Jan. 27, 1981 | G.L. Croomeens | Infeed assembly for random length end shaping machines | joint making machines | |