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English: Diagram of single wire high frequency lighting system, fig. 1 from Nikola Tesla's US patent no. 454622 System of electric lighting granted June 23, 1891. This is important because it contains the first appearance of his Tesla coil circuit, a resonant transformer which generates high voltage high frequency alternating current (AC). The Tesla coil circuit is in the upper left consisting of a AC generator (G) powering a step-up transformer (P,S) which charges a capacitor (C) which discharges through the spark gap (a) and the primary (P')of the resonant transformer, creating high frequency oscillating currents. The secondary of the transformer (S') produces high voltage pulses.

In Tesla's lighting system the high voltage pulses power prototype single electrode fluorescent light bulbs. These consist of a parially evacuated glass bulb with a single electrode. The high potential ionizes the gas producing a glow discharge The other end of the coil is attached to an electrode in the wall of the room (W)

Alterations to image: cropped out part of wall (W) to make image more compact
Date
Source Retrieved from US Patent No. 454622, Nikola Tesla System for electric lighting, filed April 23, 1891, granted June 25, 1891 on Google patent search
Author Nikola Tesla

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May or may not be in the public domain
 In general, the contents of United States patents are in the public domain.

In specific cases, patent applicants and holders may claim copyright in portions of those documents. In those specific cases, applicants are required to identify the portions that are protected under copyright, and are additionally required to state the following within the body of the application and patent (see 37 CFR 1.71(d) & (e) and 37 CFR 1.84(s), and MPEP § 608.01(e) & (w) and MPEP § 1512):

A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by any­one of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.

The original patent should be checked for the presence of such language before an assumption is made that the contents are in the public domain. (This template can be replaced by {{PD-US-patent-no notice}} in such cases.)

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inception

25 March 1891Gregorian

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