File:USpatent4820468-fig-1.png

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Description
English: Drawing showing use of corrugated plastic in welded hollow plastic plate air-to-air heat exchangers.
Date Patent filed Mar. 22, 1985 issued Apr. 11, 1989
Source U.S. Patent 4,820,468 Figure 1. “Method for making welded hollow plastic plate heat exchangers.”
Author The draftsman of the patent attorney of Martval J. Hartig, inventor.
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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current07:52, 7 June 2008Thumbnail for version as of 07:52, 7 June 20081,314 × 636 (22 KB)Archimerged (talk | contribs){{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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