US Patent 10576400 Drain protection

A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises(A) a polymeric sheet which (i) is on top of the drain and (ii) (a) is substantially impervious to water or (b) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows the liquid to pass through it, and(B) gaskets which (i) are attached to edges of the polymeric sheet and (ii) secure the edges of the polymeric sheet to the hard surface.