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}}.
原始上傳日誌
The original description page was here. All following user names refer to en.wikipedia.
Upload date | User | Bytes | Dimensions | Comment
2007-05-17 16:55 (UTC) | Crum375 | 7136 (bytes) | 647×232 | Fig. 2 from US Patent 5188107 http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=US5188107 {{PD-US-patent}}