Exhaust ventilator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 22, 2002
Grant Date -
N/A
app pub date -
Oct 20, 1999
filing date -
Oct 20, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust ventilator has a frame on which an opening is formed. The frame is composed of a main frame and a flange. Partitions divide the opening of the frame into a plurality of air vents in a matrix manner. Butterfly valves of plate shape have their upper end fixed to the partitions. Lower portions of the butterfly valves are able to open and close the air vents. The frame, partitions and butterfly valves are made of the same olefinic material. Thus, they can be recycled without disassembling.
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Family
International Classification(s)
Cited Art Landscape
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