Ventilation grids

Details Ventilation grids Ventilation grids

2007-03-13

2007-03-13

Oliver, Catherine R. (Department: 2914)

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

Design Patent

active

29210786

CLAIM:
The ornamental design for ventilation grids, as shown.

REFERENCES:
patent: 2021086 (1935-11-01), Oskamp
patent: D113047 (1939-01-01), O'Day
patent: D118851 (1940-02-01), Demuth
patent: D300174 (1989-03-01), Waltz et al.
patent: D309348 (1990-07-01), Sarazen et al.
patent: D341443 (1993-11-01), Shapiro
patent: D370723 (1996-06-01), Nishizawa
patent: D438328 (2001-02-01), Pan

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