File:GWP-836531Patent.png
Summary
| Description |
English: Diagram of a crystal radio receiver from G. W. Pickard's 1906 patent on the silicon crystal detector U.S. Patent 836,531 "Means for receiving intelligence communicated by electric waves". This was the first crystal detector produced commercially, and this diagram is one of the first crystal radio circuits.
Italiano: Schema elettrico radio a galena |
| Date | |
| Source | U.S. Patent 836,531, Greenleaf Whittier Pickard, "Means for receiving intelligence communicated by electric waves", filed: 30 August 1906, granted: 20 November 1906, fig. 1 |
| Author | Greenleaf Whittier Pickard. |
Licensing
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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):
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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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. 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, 1930. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:13, 11 May 2007 | | 935 × 876 (15 KB) | wikimediacommons>Reddi | U.S. Patent 836,531 "Means for receiving intelligence communicated by electric waves", 1906. G. W. Pickard. |
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