Keystone

Details Keystone Keystone

2006-09-12

2006-09-12

Delehanty, Robert A. (Department: 2914)

Building units and construction elements

Architectural stock material

Construction block or brick type

Design Patent

active

D0528222

CLAIM:
The ornamental design for a keystone, as shown and described.

REFERENCES:
patent: 3778945 (1973-12-01), Medow
patent: 3942290 (1976-03-01), O'Sheeran
patent: 5218801 (1993-06-01), Hereford
patent: D434159 (2000-11-01), Hampel
patent: D460830 (2002-07-01), Unger
patent: 2005/0198914 (2005-09-01), Lyons et al.

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