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| Patents for Frank Harrington | |||||
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| Number | Date | Patentee | Title | Type | |
| 628,730 | Jul. 11, 1899 | F. Harrington, A. Whitney | Work Holder for Lathe Spindles | metal lathe chucks | |
| 644,279 | Feb. 27, 1900 | F. Harrington, E.M. Couch | FeedAttachment for Screw or Analogous Machines | screw machines | |
| 644,310 | Feb. 27, 1900 | F. Harrington, L.C. Woerner | Multiple Spindle Screw Machine | screw machines | |