Concrete block

Details Concrete block Concrete block

1993-05-24

1995-06-27

Clark, Doris

Building units and construction elements

Architectural stock material

Construction block or brick type

Patent

active

D03598110

REFERENCES:
patent: D136928 (1943-12-01), Esson
patent: D298463 (1988-11-01), Forsberg
patent: D305574 (1990-01-01), Sakata
patent: D311444 (1990-10-01), Forsberg
patent: D316904 (1991-05-01), Forsberg
patent: 1534060 (1925-04-01), Dexter
patent: 2061631 (1936-11-01), Lan
patent: 2881613 (1959-04-01), Taylor et al.
patent: 4738059 (1988-04-01), Dean, Jr.
patent: 4798499 (1989-01-01), Yamada
patent: 4802320 (1989-02-01), Forsberg
Balcon, Inc. brochure page, dated 1984, top left side of page stone labeled 4.

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