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Fitxer original ‎(1.314 × 636 píxels, mida del fitxer: 22 Ko, tipus MIME: image/png)

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Resum

Descripció
English: Drawing showing use of corrugated plastic in welded hollow plastic plate air-to-air heat exchangers.
Data Patent filed Mar. 22, 1985 issued Apr. 11, 1989
Font U.S. Patent 4,820,468 Figure 1. “Method for making welded hollow plastic plate heat exchangers.”
Autor The draftsman of the patent attorney of Martval J. Hartig, inventor.
Permís
(Com reutilitzar aquest fitxer)
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}}.

Llicència

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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Data/horaMiniaturaDimensionsUsuari/aComentari
actual09:52, 7 juny 2008Miniatura per a la versió del 09:52, 7 juny 20081.314 × 636 (22 Ko)Archimerged{{Information |Description={{en|1=Drawing showing use of w:corrugated plastic in welded hollow plastic plate heat exchangers. {{patent}}}} |Source=U.S. Patent 4,820,468 Figure 1. |Author=The draftsman of the patent attorney of Martval J. Hartig, inven

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