Seal between two relatively rotating parts for sealing fluid under pressure

Claim 1

IN A FLUID TRANSMISSION AND THE LIKE HAVING CYLINDRICAL SHAFT MEMBER AND A MEMBER PROVIDING A CYLINDRICAL BORE, SAID MEMBERS ROTATING RELATIVELY TO ECH OTHER DURING OPERATION AT HIGH SPEEDS IN THE ORDER OF 600 TO 2600 FEET PER MINUTE COOLED BY OIL UNDER PRESSURE IN THE ORDER OF 250 P.S.I., THE SHAFT HAVING AT LEAST ONE ANNULAR GROOVE THAT HAS A RADIAL WALL AT ONE END, THE COMBINATION OF: A SEAL COMPRISING A CONTINUOUS ANNULUS OF OIL-RESISTANT SYNTHETIC RUBBER HAVING A FLAT RADIAL END FACE AND A CYLINDRICAL RADIALLY OUTER FACE AND HAVING SUFFICIENT STRETCH AND ELASTICITY TO BE MOVED AXIALLY ALONG SAID SHAFT AND SNAPPED INTO SAID GROOVE WHERE IT ENGAGES ONLY SAID RADIAL WALL, ENGAGING ITS WITH SAID RADIAL END FACE, AND ENGAGES SAID BORE WITH SAID CYLINDRICAL OUTER FACE, ONE OF SAID FACES BEING ENGAGED NONROTATABLY WITH THE SAID MEMBER IT ENGAGES, THE OTHER SAID FACE BEING ROTATABLY ENGAGED WITH THE SAID MEMBER IT ENGAGES, SAID OIL HOLDING THE SAID RADIAL FACE IN CONTACT WITH SAID RADIAL WALL TO PREVENT LEAKING OF SAID OIL AND CONSTITUTING THE SOLE MEANS DOING SO, SAID SYNTHETIC RUBBER BEING FLEXIBLE ENOUGH TO FORM A GOOD STATIC SEAL AND A GOOD DYNAMIC SEAL UNDER SAID PRESSURE AND HAVING A THERMAL COEFFICIENT OF OF EXPANSION LOW ENOUGH TO PREVENT PLASTIC FLOW AT OPERATING TEMPERATURES DEVELOPED IN SAID ANNULUS AND A COEFFICIENT OF FRICTION LOW ENOUGH TO PREVENT OVERHEATING IN OPERATION.