File:Norton mechanical filter.png
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editDescriptionNorton mechanical filter.png |
English: A mechanical filter designed using electrical network theory |
Date | 31st May 1929 (filed) |
Source | US patent US1792655 |
Author | Edward Lawry Norton |
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PD-US-PATENT-NO NOTICE. |
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editPublic domainPublic domainfalsefalse |
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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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editTransferred from en.wikipedia to Commons by Wdwd using CommonsHelper.
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- 2009-06-25 22:30 Spinningspark 715×498× (35668 bytes) {{Information |Description=A mechanical filter designed using electrical network theory |Source=US patent US1792655 |Date=31st May 1929 (filed) |Author=[[Edward Lawry Norton]] |other_versions= }} == Licensing == {{PD-US-patent}} {{KeepLocal}}
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