Architectural stock material > Construction block or brick type (20) > Perforated or openwork (21) > Symmetrical > Rectangular or square detail > Patents

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Browse by Category: Main > Construction

Class Information
Number: D25/118
Name: Building units and construction elements > Architectural stock material > Construction block or brick type (20) > Perforated or openwork (21) > Symmetrical > Rectangular or square detail
Description:

Patents under this class:

1 2 3

Patent Number	Title Of Patent	Date Issued
D251305	Building construction block	Mar. 13, 1979
D246470	Building block	Nov. 22, 1977
4040226	Building block with wave-shaped upper and lower support surfaces	Aug. 9, 1977
D245340	Building block	Aug. 9, 1977
4035975	Wall of building blocks and method of constructing it	Jul. 19, 1977
4031678	Interlocking building block construction	Jun. 28, 1977
D243855	Building brick	Mar. 29, 1977