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Class Information
Number: 454/336
Name: Ventilation > Having inlet airway > With adjustable valve (e.g., damper, etc.) > Plural blades pivoting along parallel axes > Adjacent blades pivot in opposing directions
Description: Subject matter wherein the two slats or panels are positioned next to one another and wherein the slats or panels rotate about their axes in opposite directions.

Patents under this class:

Patent Number Title Of Patent Date Issued
8500528 Combination bearing, linkage pin and shaft coupling for a damper Aug. 6, 2013
8449359 Structure for installing air-conditioning duct to air-conditioning unit May. 28, 2013
6484755 Blend door actuation for dual zone Nov. 26, 2002
6254475 Multi-vane register, especially for a motor vehicle air conditioning system Jul. 3, 2001
5944506 Burner assembly with tight shut-off opposed louver air damper Aug. 31, 1999
5842919 Damper actuator assembly Dec. 1, 1998
5702298 Unsheathed cable activated damper control system Dec. 30, 1997
5580307 Shutter for air or smoke conduits Dec. 3, 1996
5454757 Interchangeable gears for damper assemblies Oct. 3, 1995
4541328 Damper seal apparatus Sep. 17, 1985
4513655 Damper and blade therefor Apr. 30, 1985
4248140 Duct outlet Feb. 3, 1981
4241647 Air damper valve Dec. 30, 1980
4241539 Seal for sides of pivoted blade structures Dec. 30, 1980
4207864 Damper Jun. 17, 1980

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