Seal seat backing for mechanical seals

Claim 1

IN COMBINATION, A STATIONATY MACHINE CASING, A ROTARY EXTENDING INTO A SHAFT OPENING IN SAID CASING, A RIGID SEAL SEAT RING DISPOSED IN AN AXIALLY FACING, CYLINDRICAL CHANNEL FORMED IN SAID CASING AND EXTENDING ABOUT SAID SHAFT, MEANS, IN SAID CHANNEL, COACTING WITH SAID RING TO HOLD THE LATTER AGAINST ROTATION, PACKING RINGS AT THE OUTER AND INNER PERIPHERIES OF SAID SEAL SEAT RING EFFECTING SEALS BETWEEN THE LATTER AND OPPOSED CYLINDRICAL SURFACES OF SAID CASING DEFINING SAID CHANNEL, THEREBY FORMING A PRESSURE CHAMBER IN THE BOTTOM OF SAID CHANNEL, A STATIC BODY OF FLUID IN SAID CHAMBER, HOLDING SAID SEAL SEAT RING AGAINST ENGAGEMENT WITH THE BOTTOM WALL OF SAID CHANNEL, DUCT MEANS IN SAID MACHINE CASING CONSITUTING SOLE MEANS FOR INTRODUCING FLUID INTO SAID CHAMBER, CLOSURE MEANS IN SAID DUCT MEANS CONTINUOUSLY CLOSING THE LATTER AGAINST MOVEMENT OF FLUID THERETHROUGH RELATIVELY TO SAID CHAMBER, A ROTARY SEALING RING CARRIED UPON AND SEALEDD WITH RESPECT TO SAID SHAFT AND CONSTRAINED TO TURN THEREWITH, AND MEANS URGING SAID ROTARY SEALING RING AXIALLY TO BRING AN ANNULAR SURFACE OF THE LATTER RING INTO SLIDING SEALING ENGAGEMENT WITH AN ANNULAR SURFACE OF SAID SEAL SEAT RING.