| Patents Granted on 1931-04-28 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| D84,049 | Apr. 28, 1931 | T.G. Myers | Design for a vertical electric motor | electric motors |
| 1,802,342 | Apr. 28, 1931 | A.F. Froussard | Shaft Coupling | industrial machine shaft couplings |
| 1,802,574 | Apr. 28, 1931 | C. Rasmussen | Nipple-holding chuck | pipe threading machines |
| 1,802,800 | Apr. 28, 1931 | C.G. Wilderson | Router attachment for woodworking machines | routing machines |
| 1,802,914 | Apr. 28, 1931 | C.W. Gruber | V Block | V blocks |
| 1,802,992 | Apr. 28, 1931 | H.S. Walthers | Circular-cutter mounting | cutterheads |
| 1,803,004 | Apr. 28, 1931 | R.L. Carter | Template for tool designing | tool making |
| 1,803,068 | Apr. 28, 1931 | R.S. McKeage | Rotary cutter device | handheld power tools |
| 1,803,120 | Apr. 28, 1931 | H.E. McCray | Internal Combustion Engine | |
| 1,803,165 | Apr. 28, 1931 | C. Booth | Centerless Grinder | grinding machines |
| 1,803,307 | Apr. 28, 1931 | O.P. Wodack | Portable electric tool | handheld power drills |
