Patent ID: 8777229

Claim:
A liftoff carbon seal assembly comprising: a rotating seal backer plate rotatable about an axis; a rotating seal plate retainer adjacent to said rotating seal backer plate, said rotating seal plate retainer including a lip extending radially away from said axis; a rotating seal plate having a first seal plate end face and a second seal plate end face, said first seal plate end face facing said rotating seal backer plate, and wherein a first portion of said second seal plate end face extends axially beyond a rotating seal plate retainer face of said rotating seal plate retainer in a direction along said axis, and wherein said lip engages a second portion of said second seal plate end face, said first portion extending axially beyond said second portion; wherein said seal backer plate includes an axially extending portion of a stepped interface that extends into a chamfered corner recess of said rotating seal plate such that said axially extending stepped interface is radially between said rotating seal plate and said seal plate retainer; and a static carbon seal adjacent to said rotating seal plate.