Image:USpatent4820468-fig-1.png
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[edit] Summary
| Description |
English: Drawing showing use of corrugated plastic in welded hollow plastic plate air-to-air heat exchangers.
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| Source |
U.S. Patent 4,820,468 Figure 1. “Method for making welded hollow plastic plate heat exchangers.” |
| Date |
Patent filed Mar. 22, 1985 issued Apr. 11, 1989 |
| Author |
The draftsman of the patent attorney of Martval J. Hartig, inventor. |
| Permission (Reusing this image) |
see below |
[edit] Licensing:
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The text and illustrations of US patents are in the public domain unless the patent text contains a specific notice that portions are copyrighted.[1][2] [3]
The original patent contains no such notice, so its contents are in the public domain. |
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 07:52, 7 June 2008 | 1,314×636 (22 KB) | 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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