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| Patents for O. S. Walker & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 411,845 | Oct. 01, 1889 | O.S. Walker | Drill-grinding machine | sharpening machines | |
| 425,839 | Apr. 15, 1890 | O.S. Walker | Twist-drill-grinding machine | sharpening machines | |
| 564,296 | Jul. 21, 1896 | O.S. Walker | Magnetic chuck | magnetic chucks | |
| 607,306 | Jul. 12, 1898 | O.S. Walker | Twist-drill-grinding machine | drill grinders | |
| 614,190 | Nov. 15, 1898 | O.S. Walker | Magnetic chuck | magnetic chucks | |
| 643,927 | Feb. 20, 1900 | O.S. Walker | Drill-grinder | drill sharpening machines | |