Block

Details Block Block

1998-12-30

2000-08-01

Zarfas, Louis S.

Building units and construction elements

Architectural stock material

Construction block or brick type

2501

Patent

active

D04290054

REFERENCES:
patent: 91158 (1869-06-01), Paul
patent: 103105 (1870-05-01), Van Camp et al.
patent: D280024 (1985-08-01), Risi et al.
patent: D313280 (1990-12-01), Rodenburgh et al.
patent: D397808 (1998-09-01), Dawson
patent: 2011531 (1935-08-01), Tranchell
patent: 4498803 (1985-02-01), Quittner
patent: 4681302 (1987-07-01), Thompson
patent: 5568994 (1996-10-01), Dawson

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