File:Zobel original drawing.PNG
Original file (1,528 × 406 pixels, file size: 88 KB, MIME type: image/png)
Summary[edit]
| Description |
Impedance matching circuit showing m-derived topology |
|---|---|
| Source |
US Patent 1557229 |
| Date |
13 October 1925 |
| Author |
O J Zobel |
| Permission (Reusing this file) |
See below.
|
Licensing[edit]
 | In general, the contents of United States patents are in the public domain in the US.[1] 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: [2][3][4](archived) 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. |
 | The uploader or another editor requests that a local copy of this file be kept. This image or media file may be available on the Wikimedia Commons as File:Zobel original drawing.PNG. While the license of this file may be compliant with the Wikimedia Commons, an editor has requested that the local copy be kept too. This file does not meet CSD F8 and should not be tagged as a Commons duplicate. If you desire to nominate it for deletion, notify the tagging editor. |  |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:16, 12 April 2008 | | 1,528 × 406 (88 KB) | Spinningspark (talk | contribs) | |
| 00:20, 11 April 2008 |  | 1,539 × 405 (27 KB) | Spinningspark (talk | contribs) | Author: O J Zobel Source: US Patent 1557229 {{PD-US-patent}} |
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File usage
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- File:Zobel original drawing.PNG from Commons
