| Patents for Frank Armstrong |
Patents 1 -
15
of 18
      |
| Number | Date | Patentee | Title | Type |
| 212,413 | Feb. 18, 1879 | J.H. Vinton | Lathe-Chuck | metal lathe chucks |
| 221,633 | Nov. 11, 1879 | J.H. Vinton | Pipe-Wrench | wrench handle components |
| 233,821 | Oct. 26, 1880 | J.H. Vinton | Machine for Cutting Screw Threads | metal threading machines |
| 263,001 | Aug. 22, 1882 | J.H. Vinton | Machine for Cutting Screw Threads | metal threading machines |
| 268,978 | Dec. 12, 1882 | F. Armstrong | Tap Wrench | tap wrenches and die stocks |
| 269,141 | Dec. 12, 1882 | N.W. Vandegrift | Pipe Vise | pipe and chain vises |
| 269,153 | Dec. 12, 1882 | F. Armstrong | Thread Cutting Die | taps and dies |
| 274,544 | Mar. 27, 1883 | F. Armstrong | Wrench | pipe wrenches |
| 274,545 | Mar. 27, 1883 | J.H. Hine, F. Armstrong | Wrench | quick adjust wrenches |
| 291,266 | Jan. 01, 1884 | N.W. Vandegrift, F. Armstrong | Pipe Wrench | pipe wrenches |
| 291,267 | Jan. 01, 1884 | N.W. Vandegrift, F. Armstrong | Pipe Wrench | pipe wrenches |
| 298,043 | May 06, 1884 | N.W. Vandegrift | Wrench | pipe wrenches |
| 330,175 | Nov. 10, 1885 | N.W. Vandegrift, F. Armstrong | Pipe-cutter | plumber |
| 335,009 | Jan. 26, 1886 | G.A. Barnes | Chuck | metal lathe chucks |
| 335,986 | Feb. 09, 1886 | N.W. Vandegrift, F. Armstrong | Wrench | quick adjust wrenches |
