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Summary

Description
English: Impedance matching circuit showing m-derived topology.
Date 13 October 1925
11 April 2008 (original upload date)
Source US Patent 1557229
Transferred from en.wikipedia to Commons by Wdwd using CommonsHelper.
Author O J Zobel
The original uploader was Spinningspark at English Wikipedia.

Licensing

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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Original upload log

The original description page was here. All following user names refer to en.wikipedia.
  • 2008-04-12 01:16 Spinningspark 1528×406× (89872 bytes)
  • 2008-04-11 00:20 Spinningspark 1539×405× (27854 bytes) Author: O J Zobel Source: US Patent 1557229 {{PD-US-patent}}

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13 October 1925Gregorian

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Date/TimeThumbnailDimensionsUserComment
current10:09, 15 June 2024Thumbnail for version as of 10:09, 15 June 20241,528 × 406 (88 KB)OgreBot(BOT): Reverting to most recent version before archival
10:08, 15 June 2024Thumbnail for version as of 10:08, 15 June 20241,539 × 405 (27 KB)OgreBot(BOT): Uploading old version of file from en.wikipedia; originally uploaded on 2008-04-11 00:20:56 by Spinningspark
18:59, 16 January 2011Thumbnail for version as of 18:59, 16 January 20111,528 × 406 (88 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|Impedance matching circuit showing m-derived topology}} |Source=Transferred from [http://en.wikipedia.o

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