Damper for round duct

Details Damper for round duct Damper for round duct

2002-05-22

2003-06-24

Zarfas, Louis S. (Department: 2914)

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

Design Patent

active

D0476407

CLAIM:
The ornamental design for a damper for round duct, as shown and described.

REFERENCES:
patent: D86776 (1932-04-01), Klomparens
patent: D165983 (1952-02-01), Kennedy
patent: 3577654 (1971-05-01), Marley
patent: 4335647 (1982-06-01), Timmons
patent: D317819 (1991-06-01), Sello
patent: D372775 (1996-08-01), Schuler
patent: D437405 (2001-02-01), Schrank

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