E04F 13/077

Composed of several layers

Official title: composed of several layers, e.g. sandwich panels (E04F13/075 takes precedence){(not used, see E04F13/0866)}

E04F13/077 (Composed of several layers) appears on 80 US grants and 105 published applications in this corpus.

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105
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7 Oct 2025

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E04F 13/077: granted patents and published applications per publication year
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201669
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