page_title: List of Nikola Tesla patents
section_title: Patents #51–#100
hierarchical_section_title: List of Nikola Tesla patents / American / Patents #51–#100
caption_attribution_description: English: Bifilar coil in Nikola Tesla's United States patent 512,340 of 1894. Tesla explains that in some applications (which he does not specify) the self-inductance of a conventional coil is undesired and has to be neutralised by adding external capacitors. The bifilar coil in this configuration has increased self-capacitance, thereby saving the cost of the capacitors. It is notable that this is not the kind of bifilar winding used in non-inductive wirewound resistors where the windings are wired anti-series to null out self-inductance. It's also interesting to note that Tesla's bifilar coil is used in John Bedini's permanent back emf motor which are (alleged) overunity motors with open loop circuts. For more information see John Bedini.
context_page_description: Nikola Tesla was an inventor who obtained around 300 patents worldwide for his inventions. Some of Tesla's patents are not accounted for, and various sources have discovered some that have lain hidden in patent archives. There are a minimum of 278 patents issued to Tesla in 26 countries that have been accounted for. Many of Tesla's patents were in the United States, Britain, and Canada, but many other patents were approved in countries around the globe. Many inventions developed by Tesla were not put into patent protection.
context_section_description: U.S. Patent 487,796 - System of Electrical Transmission of Power - 1892 December 13 - Alternating current generator consisting of independent armature-circuits formed by conductors alternately disposed; Currents developed differ in phase and the field magnet poles in excess of the number of armature-circuits; Motor having independent energizing circuits connected to the armature-circuit of the alternating current generator; Rotating magneto-electric machine yielding a given number of current impulses or alterations for each turn or revolution; Poles which in number are less than the number of current impulses produced in each motor-circuit by one turn or revolution; Multipolar alternating-current machine.
  U.S. Patent 511,559 - Electrical Transmission of Power - 1893 December 26 - Method of operating motors having independent energizing circuits; Passing alternating currents through circuits and retarding the phases of the current in one circuit to a greater extent; Directing alternating currents from a single source through both circuits of a motor and varying or modifying the relative resistance or self-induction of motor circuits, producing in currents differences in phases.
  U.S. Patent 511,560 - System of Electrical Power Transmission - 1893 December 26 - Motor having independent energizing circuits connected with a source of alternating currents; Means of rendering the magnetic effects to said energizing circuit of difference phase; Armature within the influence of the energizing circuit; Energizing circuits connected in derivation or multiple arc and of different active or variable resistance (or self-inductance); Pairs of mains connected and a multiple circuit differential phase; Change of time-period of currents passing through an electro-motive phase-changing device interposed between the mains and the destination; Includes a correction.
  U.S. Patent 511,915 - Electrical Transmission of Power - 1894 January 2 - Method of operating electro-magnetic motors; Passing alternating currents through one of the energizing circuits and inducing by such current in the other energizing circuit or circuits of the motor.
  U.S. Patent 511,916 - Electric Generator - 1894 January 2 - Combination with the piston or equivalent element of an engine which is free to reciprocate under the action thereon of steam or a gas under pressure, of the moving conductor or element of an electric generator in direct mechanical connection; Engine and generator being adjusted by their relative adjustment with respect to period to produce currents of constant period; Electric generator having inducing or induced elements one of which is capable of oscillation in the field of force, the movable element being carried by the piston rod of the engine; Relation as to respect of period of electrical vibration will not disturb the period of the engine; Cylinder and piston reciprocating by steam or gas under pressure of a spring maintained in vibration by the movement of the piston, and the electric generator, the movable conductor or element of which is connected with the piston; Method of constructing and adapting elements; Imparting the oscillation of an engine to the moving element of an electric generator and regulating the period of mechanical oscillation by adjustment of the reaction of the electric generator. 
  U.S. Patent 512,340 - Coil for Electro-Magnets - 1894 January 9 - Effect of mutual relation self-induction exploited; Adjacent coil convolutions formed parts exists so that the potential difference is sufficient to neutralize negative effects; Object to avoid expensive, cumbersome, and difficult condensers; Bifilar coil winding technique.
  U.S. Patent 514,167 - Electrical Conductor - 1894 February 6 - Prevent loss in line conductors; Insulate and encase conductors with a sheathing which is connected to the ground; Sheath or screen; Coaxial cabling.
  U.S. Patent 514,168 - Means for Generating Electric Currents - 1894 February 6 - Generating and utilizing electrical energy discovered by Tesla; related to US454622 and US462418; Maintenance of interm
caption: 512340: Coil for Electro-Magnets; bifilar coils.
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