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| Patents for Theo. G. Koster | |||||
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| Number | Date | Patentee | Title | Type | |
| 247,406 | Sep. 20, 1881 | N. Purdy | Pipe Tongs | chain and strap wrenches | |
| 249,394 | Nov. 08, 1881 | I.B. Potts | Pipe Wrench | pipe wrenches | |
| 284,521 | Sep. 04, 1883 | T.L. Whitacre | Wrench For Wagon Axle Nuts | axle nut wrenches | |