Fluid seal and cooperating groove

Claim 1

SEALING MEANS FOR A PRESSURIZED FLUID COMPRISING: A PAIR OF BEARING MEANS; GROOVE MEANS HAVING A PAIR OF SIDE WALL SURFACES AND A BOTTOM SURFACE IN ONE OF SAID BEARING MEANS; SAID OTHER BEARING MEANS HAVING A BEARING SURFACE EXTENDING ACROSS SAID GROOVE MEANS; AN ENDLESS ANNULAR SEALING RING OF A FLEXIBLE ELASTOMERIC SUBSTANCE IN SAID GROOVE MEANS; SAID RING HAVING UPPER, BOTTOM AND SIDE WALL SURFACES; SAID UPPER SURFACE AND SAID CONTACTING THEREAROUND SAID BEARING SURFACE AND SAID BOTTOM SURFACE OF SAID RING BEING SPACED ABOVE SAID BOTTOM SURFACE OF SAID GROOVE MEANS AND HAVING A GENERALLY ARCHED RECESSED CONFIGURATION TO PROVIDE THIN RELATIVELY FLEXIBLE LIP PORTIONS ADJACENT SAID SIDE WALL SURFACES OF SAID GROOVE MEANS; AND SAID RING BEING NARROWER THAN SAID GROOVE MEANS EXCEPT AT THE PORTION OF SAID SIDE WALL SURFACES OF SAID RING ADJACENT THE BOTTOM SUFRACE OF SAID RING AT WHICH POINT SAID SIDE WALL SURFACES OF SAID RING AND SAID GROOVE MEANS CONTACT EACH OTHER FOR PREVENTING TRANSMISSION OF FLUID ABOUT SAID RING AT LOW DIFFERENTIAL PRESSURE ON SAID SIDE WALL SURFACES OF SAID RING.