Patent ID: 7832735

Claim:
A fluid seal assembly including a fluid seal unit having an elastomeric seal body and a seal band defined by the meeting of air and oil side surfaces, and a high pressure support ring received in a pocket in said seal body said fluid seal being adapted to seal a reciprocable member under high pressure conditions, and a protective filter unit for said fluid seal unit, said protective filter unit lying on the oil side of said fluid seal unit, said fluid seal unit also including an axially extending casing unit having a stiff elastomeric outside diameter surface adapted to be snugly received within a seal counterbore, and an inside diameter elastomeric surface, said protective filter unit having an axially extending portion, a radially extending portion including a first, dimensionally fixed fine mesh filter screen, located within said radially extending portion, and a second, radially innermost excluder means having a relatively rigid member supporting said excluder means and being adapted to contact said reciprocable member in particulate excluding relation, said axially extending portion of said protective filter unit snugly engaging said inside diameter elastomeric surface lying on said axially extending inner portion of said casing unit, wherein said radially innermost excluder means is adapted to contact said reciprocable member in particulate excluding relation comprises a groove in said radially innermost means having a quad ring disposed therein, said quad ring being made from a fine mesh filter medium.