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File:454622.png

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Description
English: U.S. Patent 0,454,622 - System of Electric Lighting - 1891 June 23 - Apparatus devised for the purpose of converting and supplying electrical energy in a form suited for the production of certain novel electrical phenomena, which require currents of higher frequency and potential. It specifies an energy storage capacitor and discharger mechanism on the primary side of a radio-frequency transformer. This is the first-ever disclosure of a practical RF power supply capable of exciting an antenna to emit powerful electromagnetic radiation.
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(patent filed april 1891 http://www.google.com/patents?id=wmBOAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false
Source Originally uploaded at http://peswiki.com/index.php/Image:454622.png
Author Nikola Tesla
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(Reusing this file)
Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:454622.png

Original upload log edit

date/time username resolution size edit summary
10:44, 27 May 2007 w:en:User:Reddi 481×428 41 KB Originally uploaded at: http://peswiki.com/index.php/Image:454622.png ==Description== U.S. Patent 0,454,622 - System of Electric Lighting - 1891 June 23 - Apparatus devised for the purpose of converting and supplying electrical energy in a form suite

Image description page history edit

link date/time username edit summary
[1] 21:06, 11 January 2008 w:en:User:Vox Rationis
[2] 22:00, 28 December 2007 w:en:User:Liftarn
[3] 10:45, 27 May 2007 w:en:User:Reddi
[4] 10:44, 27 May 2007 w:en:User:Reddi (Originally uploaded at: http://peswiki.com/index.php/Image:454622.png ==Description== U.S. Patent 0,454,622 - System of Electric Lighting - 1891 June 23 - Apparatus devised for the purpose of converting and supplying electrical energy in a form suited )

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current03:53, 15 January 2008Thumbnail for version as of 03:53, 15 January 2008481 × 428 (41 KB)BetacommandBot (talk | contribs) Transwiki approved by: w:en:User:Vox Rationis {{Information |Description={{en|Originally uploaded at: http://peswiki.com/index.php/Image:454622.png ==Description== U.S. Patent 0,454,622 - System of Electric Lighting - 1891 June 23 - Apparatus de

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