Cambell_filter.png (724 × 178 pixels, file size: 8 KB, MIME type: image/png)
| Description |
Campbell's original sketch of his wave filter. Some annotation removed for clarity. |
|---|---|
| Source |
, Electric wave-filter, US patent 1 227 113 |
| Date |
filed 15 July 1915, issued 22 May 1917 |
| Author |
George A, Campbell (edited by SpinningSpark) |
| 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. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:20, 26 July 2009 | | 724 × 178 (8 KB) | Spinningspark (talk | contribs) | {{Information |Description=Campbell's original sketch of his wave filter. Some annotation removed for clarity. |Source=, ''Electric wave-filter'', US patent 1 227 113 |Date=filed 15 July 1915, issued 22 May 1917 |Author=George A, Campbell (edited by ~~~) |
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- File:Cambell filter.png from Commons
