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, "U.S. Patent 5,587,618, Direct current homopolar machine".
• W. F. Weldon, "U.S. Patent 5,530,309 Homopolar machine ".
• Antonios Challita, "U.S. Patent 5,049,771 Electrical machine".
• W. F. Weldon, "U.S. Patent 4,858,304, Method of constructing a rotor assembly for homopolar generator".
• W. F. Weldon, "U.S. Patent 4,800,311 Rotor assembly for homopolar generator".
• W. F. Weldon, "U.S. Patent 4,544,874 Homopolar generator power supply system".
• W. F. Weldon, "U.S. Patent 4,246,507 Removable brush mechanism for a homopolar generator ".
• Esko Ensio hubta-Koivisto, "U.S. Patent 3,469,137 Electric unipolar motor".
• E. C. Ketchum and D. H. Andrews, "U.S. Patent 1,082,579 Dynamo electric machine".
• A. Kingsbury, "U.S. Patent 992,965 Dynamo electric machine".
• W. A. Dick, "U.S. Patent 992,943 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 988,377 Dynamo electric machine".
• H. Hertz, "U.S. Patent 988,340 Unipolar exciter for turbo-generators".
• D. W. Troy, "U.S. Patent 979,603 Dynamo electric machine".
• A. S. Hubbard, "U.S. Patent 970,827 Dynamo electric machine".
• B. Von Ugrimoff, "U.S. Patent 970,407 Cooling device for electrical sliding contacts".
• E. C. Ketchum, "U.S. Patent 966,839 Brush holders for dynamos".
• J. E. Noeggerath, "U.S. Patent 960,383 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 959,959 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 937,462 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 920,626 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 900,771 Armature for unipolar machines".
• J. E. Noeggerath, "U.S. Patent 895,888 Unipolar dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 895,887 Acyclic machine".
• J. E. Noeggerath, "U.S. Patent 890,697 Protective device for unipolar machine".
• A. C. Eastwood, "U.S. Patent 881,387 System of control for electric motors".
• J. E. Noeggerath, "U.S. Patent 873,072 Dynamo electric machine".
• W. Mathiesen, "U.S. Patent 861,192 Unipolar dynamo".
• E. Thomson, "U.S. Patent 859,350 Unipolar generator".
• J. E. Noeggerath, "U.S. Patent 854,756 Dynamo electric machine".
• C. Macmillan, "U.S. Patent 854,749 Power transmission mechanism".
• C. Macmillan, "U.S. Patent 850,664 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 832,742 Unipolar alternating current machine".
• E. C. Ketchum, "U.S. Patent 826,668 Dynamo".
• H. H. Wait, "U.S. Patent 806,217 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 805,315 Unipolar machine".
• C. P. Steinmetz, "U.S. Patent 804,440 Dynamo electric machine".
• J. E. Noeggerath, "U.S. Patent 789,444 Electric motor".
• E. R. Cox, Jr., "U.S. Patent 742,600 Dynamo electric machine or motor".
• B. Bjarnason, "U.S. Patent 678,157 Dynamo electric machine".
• F. W. Throop, "U.S. Patent 662,042 Dynamo electric machine".
• G. Dalen and A Hultovist, "U.S. Patent 645,943 Dynamo electric machine".
• F. G. Mayer, "U.S. Patent 561,803 Dynamo electric machine".
• E. Thomson and M. J. Wightman, "U.S. Patent 550,464 Dynamo electric machine".
• G. Rennerfelt, "U.S. Patent 523,998 Dynamo electric machine".
• H. E. Dikeman, "U.S. Patent 518,444 Dynamo electric machine".
• J. E. Maynadier, "U.S. Patent 515,882 Dynamo electric machine".
• T. L. Willson, "U.S. Patent 495,538 Dynamo electric machine".
• N. Tesla, "U.S. Patent 406,968 Dynamo electric machine".
• J. B. Entz, "U.S. Patent 400,838 Dynamo electric machine".
• R. Eickemeyer, "U.S. Patent 396,149 Unipolar dynamo electric machine".
• E. A. Sperry, "U.S. Patent 354,946 Dynamo electric machine".
• R. Eickemeyer, "U.S. Patent 352,234 Electro magnetic and megneto electric machine".
• R. Eickemeyer, "U.S. Patent 351,907 Device for taking electric currents from or to moving surfaces".
• R. Eickemeyer, "U.S. Patent 351,904 Magneto electric and electro magnetic machine".
• R. Eickemeyer, "U.S. Patent 351,903 Magneto electric and electro magnetic machine".
• R. Eickemeyer, "U.S. Patent 351,902 Magneto electric and electro magnetic machine".
• R. Eickemeyer, "U.S. Patent 342,589 Dynamo electric and electro magnetic machine".
• R. Eickemeyer, "U.S. Patent 342,588 Dynamo electric and electro magnetic machine".
• R. Eickemeyer, "U.S. Patent 342,587 Dynamo electric and electro magnetic machine".
• R. Eickemeyer, "U.S. Patent 342,504 Magneto electric and electro magnetic machine".
• S. Z. De Ferranti, "U.S. Patent 341,097 Unipolar dynamo electric machine".
• C. Batchelor and H. E. Walter"U.S. Patent 339,839 Dynamo electric machine".
• C. Hering, "U.S. Patent 339,772 Unipolar dynamo electric machine".
• G. Forbes, "U.S. Patent 338,169 Dynamo electric machine".
• A. E. G. Lubke, "U.S. Patent 293,758 Dynamo electric machine".
• A. F. Delafield, "U.S. Patent 278,516 Dynamo electric machine".