US 12,221,778 B2
Pop-up sink drain assembly with overflow knock-out blank band
Ken Sapp, Lakeville, MN (US); and DeChang Li, Maspeth, NY (US)
Assigned to COMPASS MANUFACTURING INTERNATIONAL, LLC, Louisville, KY (US)
Filed by COMPASS MANUFACTURING INTERNATIONAL, LLC, Louisville, KY (US)
Filed on Jul. 25, 2022, as Appl. No. 17/872,083.
Application 17/872,083 is a continuation in part of application No. 17/826,151, filed on May 26, 2022.
Claims priority of provisional application 63/231,177, filed on Aug. 9, 2021.
Prior Publication US 2023/0111926 A1, Apr. 13, 2023
Int. Cl. E03C 1/232 (2006.01); E03C 1/23 (2006.01)
CPC E03C 1/232 (2013.01) [E03C 1/2302 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An improved drain assembly of a type having a drain pipe with a longitudinal cylinder containing a lower unthreaded portion, a middle portion with exterior threads, and an upper unthreaded portion terminating with a flange, said longitudinal cylinder having a selected first wall thickness, the improvement consisting of:
said longitudinal cylinder including at least one thinner sidewall portion having a second wall thickness defining a knock-out blank having an exterior blank surface recessed inward compared to an exterior surface of said longitudinal cylinder, and a peripheral groove around said knock-out blank having a third wall thickness thinner than said knock-out blank providing for easy breakage and removal of said knock-out blank; and
a resilient removable knock-out band for covering a knock-out overflow aperture formed from removing said knock-out blank providing a removable water tight seal.