File:Balance board rope-brake by Frederic G Ludwig.Fig 1.PNG

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Description

The drawing is from the 1958 U.S. patent for a rocker-roller balance board designed by Frederic George Ludwig of Woodbridge, Connecticut.

In the online database of the U.S. Patent and Trademark Office, the version of the patent that includes the application for it that was filed on November 7, 1955 contains more drawings than the June 8, 1955 version does. There are also more descriptions in the November version than in the June version.

The November version's descriptions of the rope are of one that is elastic.

If the above-linked pages in the USPTO database appear empty on your screen, the cause of the problem is that your web browser lacks QuickTime Player or some other plug-in that needs to be installed.
Date
Source Patent 2,829,891 of the U.S. Patent and Trademark Office
Author Frederic George Ludwig
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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current07:08, 7 July 2011Thumbnail for version as of 07:08, 7 July 20111,078 × 1,412 (43 KB)DavidMaisel (talk | contribs){{Information |Description= The drawing is from the 1958 U.S. patent for a rocker-roller balance board designed by Frederic George Ludwig of Woodbridge, Connecticut.<br> He applied for the patent in 1955. |Source

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