File:Model M patent.png

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Original file (790 × 826 pixels, file size: 28 KB, MIME type: image/png)

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Description
English: An illustration from US patent 4,118,611 "Buckling Spring Torsional Snap Actuator".
Was used in the Model F and was the base of the Model M "membrane buckling spring switch".
Date
Source US Patent n° 4,118,611
Author Richard Harris
Permission
(Reusing this file)
Public domain 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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Public domain
This work is in the public domain because it was published in the United States between 1978 and March 1, 1989 without a copyright notice, and its copyright was not subsequently registered with the U.S. Copyright Office within 5 years.
Unless its author has been dead for several years, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macau), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation.

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Date/TimeThumbnailDimensionsUserComment
current23:13, 29 August 2006Thumbnail for version as of 23:13, 29 August 2006790 × 826 (28 KB)GreyCat (talk | contribs)An illustration from US patent 4,118,611 "Buckling Spring Torsional Snap Actuator". Source: US patent office scan {{PD-US-patent}}

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