Aluminum foil ultra-high vacuum gasket seal

Claim 1

AN ULTRA-HIGH VACUUM GASKET SEAL COMPRISING (A) FIRST AND SECOND SUBSTANTIALLY RIGID FLANGE MEMBERS WITH AT LEAST ONE OF SAID FLANGES BEING PROVIDED WITH A CENTRAL APERTURE FOR COUPLING IN A VACUUM KSYSTEM, SAID MEMBERS HAVING ANNULAR SEAL SURFACES FORMED ON RAISED FLANGE SURFACE PORTIONS AND DISPOSED IN MATING COAXIAL OPPOSED RELATION CONTIGUOUS TO SAID APERTURE, SAID SEAL SURFACES HAVING A MATING WIDTH IN THE RANGE OF ABOUT 0.010 INCH TO 0.125 INCH, AND MATING PERIPHERAL PORTIONS OF SAID FLANGES OUTWARDLY THEREFROM ARE SPACED WHEREBY THE TOTAL COMPRESSIVE FORCE BETWEEN SAID FLANGES IS BORNE BY SAID SEAL SURFACES, (B) ONE OF SAID SEAL SURFACES BEING DISPOSED AT AN ANGLE WITH RESPECT TO THE OPPOSING SEAL SURFACE SUCH THAT THE INNER CIRCUMFERENCES THEREOF MAKE INITIAL LINE CONTACT THEREBETWEEN AND SAID SEAL SURFACE ANGLE DEFINED BY THE RELATION $=(MXR(**2))/EXIO WHERE $=ANGLE OF ROTATION OF THE SEAL SURFACE M=MOMENT IN INCH LIBS. PER LINEAR INCH OF GASKET R= RADIUS TO THE CENTROID OF THE SECTION FROM THE AXIS OF THE FLANGE E=ELASTIC MODULUS IN P.S.I. IO=MOMENT OF INERTIA OF THE JFLANGE CROSS SECTION IN INCHES TO THE FOURTH POWER,