DE102007038851-A1 -- DD298532-A5   ;  DE3124925-A   ;  DE102006017622-A1   SCHOTT AG (ZEIS)   MUELLER M,  SCHWIRTLICH I,  MARTIN R,  SAHR U;  DE68907184-T2   AMERICAN TELEPHONE & TELEGRAPH CO (AMTT)   CLEMANS J E;  US4404172-A   WESTERN ELECTRIC CO INC (AMTT);  AT & T TECHNOLOGIES INC (AMTT)   GAULT W A;  DE19855061-A1   ALD VACUUM TECHNOLOGIES AG (ALDV-Non-standard)   RADEL G,  HUGO F,  SITZMANN B,  ZUCKERSTAETTER E;  DE102006017621-A1   SCHOTT AG (ZEIS)   MUELLER M,  FINKBEINER M,  SAHR U,  SCHWIRTLICH I,  CLAUSS M;  EP218088-A   ;  EP631832-A1   LEYBOLD DURFERRIT GMBH (LEYB);  ALD VACUUM TECHNOLOGIES GMBH (ALDV-Non-standard)   HUGO F;  EP996516-A1   HUGO O (HUGO-Individual)   HUGO O;  EP1162290-A1   ;  US4256530-A   CRYSTAL SYSTEMS INC (CRYS-Non-standard)   SCHMID F,  KHATTAK C P;  EP2028292-A2 -- DD298532-A5   ;  DE19855061-A1   ALD VACUUM TECHNOLOGIES AG (ALDV-Non-standard)   RADEL G,  HUGO F,  SITZMANN B,  ZUCKERSTAETTER E;  DE102004003035-A1   ;  DE102006017621-A1   SCHOTT AG (ZEIS)   MUELLER M,  FINKBEINER M,  SAHR U,  SCHWIRTLICH I,  CLAUSS M;  DE102006017622-A1   SCHOTT AG (ZEIS)   MUELLER M,  SCHWIRTLICH I,  MARTIN R,  SAHR U;  EP218088-A   ;  EP631832-A1   LEYBOLD DURFERRIT GMBH (LEYB);  ALD VACUUM TECHNOLOGIES GMBH (ALDV-Non-standard)   HUGO F;  EP748884-A1   SHARP KK (SHAF)   OKUNO T;  EP887442-A1   SHARP KK (SHAF)   YAMAZAKI M,  OKUNO T;  EP996516-A1   HUGO O (HUGO-Individual)   HUGO O;  EP1162290-A1   ;  EP372794-B1   AMERICAN TELEPHONE & TELEGRAPH CO (AMTT)   CLEMANS J E;  FR2567922-A   ;  JP10007493-A   SHARP KK (SHAF)   ASAI M;  US3721800-A   ;  US4256530-A   CRYSTAL SYSTEMS INC (CRYS-Non-standard)   SCHMID F,  KHATTAK C P;  US4381214-A   ;  US4404172-A   WESTERN ELECTRIC CO INC (AMTT);  AT & T TECHNOLOGIES INC (AMTT)   GAULT W A;  US20070169684-A1   ;  WO2007084934-A2   BP CORP NORTH AMERICA INC (BRPE)   STODDARD N G;  EP2028292-B1 -- DE102004003035-A1   ;  DE102006017621-A1   SCHOTT AG (ZEIS)   MUELLER M,  FINKBEINER M,  SAHR U,  SCHWIRTLICH I,  CLAUSS M;  DE102006017622-A1   SCHOTT AG (ZEIS)   MUELLER M,  SCHWIRTLICH I,  MARTIN R,  SAHR U;  FR2567922-A   ;  JP10007493-A   SHARP KK (SHAF)   ASAI M;  US3721800-A   ;  WO2007084934-A3   BP CORP NORTH AMERICA INC (BRPE)   STODDARD N G