US 11,731,066 B2
Variable air filter assemblies
Kevin James Barry, Raleigh, NC (US); Thaddeus Worth Tarkington, Raleigh, NC (US); and Aly Khalifa, Raleigh, NC (US)
Assigned to Second Nature Brands, Inc., Raleigh, NC (US)
Filed by Second Nature Brands, Inc., Raleigh, NC (US)
Filed on Aug. 23, 2021, as Appl. No. 17/409,545.
Application 17/409,545 is a continuation of application No. 16/569,696, filed on Sep. 13, 2019, granted, now 11,097,217.
Application 16/569,696 is a continuation of application No. 16/288,304, filed on Feb. 28, 2019, granted, now 10,427,079, issued on Oct. 1, 2019.
Claims priority of provisional application 62/694,091, filed on Jul. 5, 2018.
Claims priority of provisional application 62/636,581, filed on Feb. 28, 2018.
Prior Publication US 2021/0379519 A1, Dec. 9, 2021
Int. Cl. B01D 46/00 (2022.01); B01D 46/52 (2006.01); B01D 46/10 (2006.01)
CPC B01D 46/0005 (2013.01) [B01D 46/0002 (2013.01); B01D 46/10 (2013.01); B01D 46/521 (2013.01); B01D 2265/02 (2013.01); B01D 2271/02 (2013.01); B01D 2275/203 (2013.01); B01D 2279/50 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An air filter assembly for a heating and ventilation air conditioner (HVAC) system, the filter assembly comprising:
a filter element having at least one variable dimension;
a frame for engaging and supporting the filter element, the frame configured for being adjusted to accommodate the at least one variable dimension and secure the filter element therein,
wherein, the frame is positioned within an HVAC return to secure the filter within an airflow of the HVAC system; and
at least one grate element spanning an area defined by the frame for supporting the filter element, the grate element comprising multiple parallel arms, wherein each said arm comprises, at each of two ends thereof, a respective tooth for engaging the frame.