Nikola Tesla's U.S. Patent 512,340, granted in 1894, describes a coil for electromagnets in which adjacent conductor turns can be arranged to increase the electrical potential difference—and therefore the capacity—between turns.
Why “bifilar” matters
In plain English, the winding arrangement changes electrical characteristics of the coil. That can be interesting in resonant and high-frequency circuit contexts.
What the patent does not establish
The patent is not a demonstration that a coil creates energy from nothing. Modern claims about a complete generator must be evaluated using measurements of the complete device.
Editorial rule: Historical Tesla material is context, not a substitute for contemporary performance evidence.
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