List of homopolar generator patents

Below is a list of homopolar generator patents. A homopolar generator is an electrical generator in which the magnetic field has the same polarity at every point, so that the armature passes through the magnetic field lines of force continually in the same direction. The device is electrically symmetrical, and generates continuous current. Some of these devices also have "homopolar magnets", which have pole pieces arranged around a common centre. The United States Patent Office uses the classification class 310 (Electrical generator or motor structure) and subclass 178 (Dynamoelectric; Rotary; D.C.; Homopolar) for these devices. Many of the homopolar patents were obtained prior to 1975.

American

* G. D. Hathaway, "US patent|5587618, "Direct current homopolar machine".
* W. F. Weldon, "US patent|5530309 "Homopolar machine ".
* Antonios Challita, "US patent|5049771 "Electrical machine".
* W. F. Weldon, "US patent|4858304, "Method of constructing a rotor assembly for homopolar generator".
* W. F. Weldon, "US patent|4800311 "Rotor assembly for homopolar generator".
* W. F. Weldon, "US patent|4544874 "Homopolar generator power supply system".
* W. F. Weldon, "US patent|4246507 "Removable brush mechanism for a homopolar generator ".
* Esko Ensio hubta-Koivisto, "US patent|3469137 "Electric unipolar motor".
* E. C. Ketchum and D. H. Andrews, "US patent|1082579 "Dynamo electric machine".
* A. Kingsbury, "US patent|992965 "Dynamo electric machine".
* W. A. Dick, "US patent|992943 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|988377 "Dynamo electric machine".
* H. Hertz, "US patent|988340 "Unipolar exciter for turbo-generators".
* D. W. Troy, "US patent|979603 "Dynamo electric machine".
* A. S. Hubbard, "US patent|970827 "Dynamo electric machine".
* B. Von Ugrimoff, "US patent|970407 "Cooling device for electrical sliding contacts".
* E. C. Ketchum, "US patent|966839 "Brush holders for dynamos".
* J. E. Noeggerath, "US patent|960383 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|959959 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|937462 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|920626 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|900771 "Armature for unipolar machines".
* J. E. Noeggerath, "US patent|895888 "Unipolar dynamo electric machine".
* J. E. Noeggerath, "US patent|895887 "Acyclic machine".
* J. E. Noeggerath, "US patent|890697 "Protective device for unipolar machine".
* A. C. Eastwood, "US patent|881387 "System of control for electric motors".
* J. E. Noeggerath, "US patent|873072 "Dynamo electric machine".
* W. Mathiesen, "US patent|861192 "Unipolar dynamo".
* E. Thomson, "US patent|859350 "Unipolar generator".
* J. E. Noeggerath, "US patent|854756 "Dynamo electric machine".
* C. Macmillan, "US patent|854749 "Power transmission mechanism".
* C. Macmillan, "US patent|850664 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|832742 "Unipolar alternating current machine".
* E. C. Ketchum, "US patent|826668 "Dynamo".
* H. H. Wait, "US patent|806217 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|805315 "Unipolar machine".
* C. P. Steinmetz, "US patent|804440 "Dynamo electric machine".
* J. E. Noeggerath, "US patent|789444 "Electric motor".
* E. R. Cox, Jr., "US patent|742600 "Dynamo electric machine or motor".
* B. Bjarnason, "US patent|678157 "Dynamo electric machine".
* F. W. Throop, "US patent|662042 "Dynamo electric machine".
* G. Dalen and A Hultovist, "US patent|645943 "Dynamo electric machine".
* F. G. Mayer, "US patent|561803 "Dynamo electric machine".
* E. Thomson and M. J. Wightman, "US patent|550464 "Dynamo electric machine".
* G. Rennerfelt, "US patent|523998 "Dynamo electric machine".
* H. E. Dikeman, "US patent|518444 "Dynamo electric machine".
* J. E. Maynadier, "US patent|515882 "Dynamo electric machine".
* T. L. Willson, "US patent|495538 "Dynamo electric machine".
* N. Tesla, "US patent|406968 "Dynamo electric machine".
* J. B. Entz, "US patent|400838 "Dynamo electric machine".
* R. Eickemeyer, "US patent|396149 "Unipolar dynamo electric machine".
* E. A. Sperry, "US patent|354946 "Dynamo electric machine".
* R. Eickemeyer, "US patent|352234 "Electro magnetic and megneto electric machine".
* R. Eickemeyer, "US patent|351907 "Device for taking electric currents from or to moving surfaces".
* R. Eickemeyer, "US patent|351904 "Magneto electric and electro magnetic machine".
* R. Eickemeyer, "US patent|351903 "Magneto electric and electro magnetic machine".
* R. Eickemeyer, "US patent|351902 "Magneto electric and electro magnetic machine".
* R. Eickemeyer, "US patent|342589 "Dynamo electric and electro magnetic machine".
* R. Eickemeyer, "US patent|342588 "Dynamo electric and electro magnetic machine".
* R. Eickemeyer, "US patent|342587 "Dynamo electric and electro magnetic machine".
* R. Eickemeyer, "US patent|342504 "Magneto electric and electro magnetic machine".
* S. Z. De Ferranti, "US patent|341097 "Unipolar dynamo electric machine".
* C. Batchelor and H. E. Walter"US patent|339839 "Dynamo electric machine".
* C. Hering, "US patent|339772 "Unipolar dynamo electric machine".
* G. Forbes, "US patent|338169 "Dynamo electric machine".
* A. E. G. Lubke, "US patent|293758 "Dynamo electric machine".
* A. F. Delafield, "US patent|278516 "Dynamo electric machine".
* C. E. Ball, "US patent|238631 "Dynamo or magneto-electric machine".