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Summary
| Description |
English: Patent Drawing of the Original Spherical Blowout Preventer, by The Rucker Company (Shaffer),
U.S. Patent 3,667,721 (1972). |
| Date | Filed April 13, 1970 |
| Source | US Patent n° 3,667,721 |
| Author | Ado N. Vujasinovic |
Licensing
|
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}}. |
Original upload log
Transferred from en.wikipedia to Commons using For the Common Good.
The original description page was here. All following user names refer to en.wikipedia.
| Date/Time | Dimensions | User | Comment |
|---|---|---|---|
| 17:58, 24 July 2010 | 1,152 × 1,620 (312,355 bytes) | w:en:Catsquisher (talk | contribs) | <!== {{int:filedesc}} == {{Information |Description={{en|1=Patent Drawing of the Original Spherical Blowout Preventer, by The Rucker Company (Shaffer), U.S. Patent 3,667,721 (1972).}} |Source=[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HIT |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:17, 30 September 2018 | | 1,152 × 1,620 (305 KB) | Arlene the bean | Transferred from en.wikipedia: see original upload log above |
File usage
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