| All Patents of Type: DC motors |
Patents 1 -
15
of 17
      |
| Number | Date | Patentee | Title | Type |
| 132 | Feb. 25, 1837 | T. Davenport | Improvement in propelling machinery by magnetism and electro-magnetism | DC motors |
| 227,622 | May 18, 1880 | W.W. Griscom | Electro-Magnetic Motor | DC motors |
| 227,623 | May 18, 1880 | W.W. Griscom | Electro-Magnetic Motor | DC motors |
| 227,845 | May 18, 1880 | W. Sawyer | Dynamo Electric Machine | DC motors |
| 248,435 | Oct. 18, 1881 | T.A. Edison | Utilizing Electricity as Motive Power | DC motors |
| 264,982 | Sep. 26, 1882 | E. Weston | Electro Magnetic Motor | DC motors |
| 316,091 | Apr. 21, 1885 | E. Weston | Electro-Magnetic Motor | DC motors |
| 316,092 | Apr. 21, 1885 | E. Weston | Electro Magnetic Motor | DC motors |
| 324,667 | Aug. 18, 1885 | P. Diehl | Electric Motor | DC motors |
| 356,834 | Feb. 01, 1887 | W.W. Griscom | Electric Motor | DC motors |
| 539,277 | May 14, 1895 | J.C. Lincoln | Electric Motor | DC motors |
| 660,908 | Oct. 30, 1900 | B.G. Lamme | Variable-speed electric motor | DC motors |
| 829,975 | Sep. 04, 1906 | J.C. Lincoln | Variable Speed Electric Motor | DC motors |
| 847,088 | Mar. 12, 1907 | J.C. Lincoln | Variable Speed Electric Motor | DC motors |
| 1,043,325 | Nov. 05, 1912 | J.C. Lincoln | Variable Speed Electric Motor | DC motors |
