Glass seal

Claim 2

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead-silica glass containing the following relative proportions of lead oxide and silica: ______________________________________ PbO about 45 to about 65 wt. % SiO.sub.2 about 55 to about 35 wt. % ______________________________________ and the following other components in quantities based on the total weight of lead oxide and silica: ______________________________________ Al.sub.2 O.sub.3 about 3 to about 4 wt. % ZnO about 7 to about 8 wt. % CaO 0 to about 6 wt. % BaO 0 to about 7 wt. % Bi.sub.2 O.sub.3 0 to about 7 wt. %. ______________________________________

Claim 3

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead oxide-silica glass consisting of lead oxide and silica in the following relative proportions: ______________________________________ PbO about 55 to about 85 wt. % SiO.sub.2 about 45 to about 15 wt. % ______________________________________

Claim 4

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead oxide-silica glass consisting of lead oxide and silica in the following relative proportions: ______________________________________ PbO about 55 to about 85 wt. % SiO.sub.2 about 45 to about 15 wt. % ______________________________________

Claim 5

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead-silica glass having the following relative proportions of lead oxide and silica: ______________________________________ PbO about 65 to about 85 wt. % -SiO.sub.2 about 35 to about 15 wt. % ______________________________________ and the following additional components in quantities based on the total weight of lead oxide and silica: ______________________________________ GeO.sub.2 about 6 to about 18 wt. % Bi.sub.2 O.sub.3 0 to about 8 wt. % BaO about 1 to about 9 wt. % CaO 0 to about 2 wt. % MgO 0 to about 2 wt. % ZnO 0 to about 13 wt. % CeO.sub.2 about 2 to about 3 wt. % Al.sub.2 O.sub.3 0 to about 5 wt. % ZrO.sub.2 0 to about 2 wt. % Na.sub.2 O 0 to about 2 wt. % K.sub.2 O 0 to about 2 wt. % ______________________________________

Claim 6

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead-silica glass having the following relative proportions of lead oxide and silica: ______________________________________ PbO about 65 to about 85 wt. % -SiO.sub.2 about 35 to about 15 wt. % ______________________________________ and the following additional components in quantities based on the total weight of lead oxide and silica: ______________________________________ GeO.sub.2 about 6 to about 18 wt. % Bi.sub.2 O.sub.3 0 to about 8 wt. % BaO about 1 to about 9 wt. % CaO 0 to about 2 wt. % MgO 0 to about 2 wt. % ZnO 0 to about 13 wt. % CeO.sub.2 about 2 to about 3 wt. % Al.sub.2 O.sub.3 0 to about 5 wt. % ZrO.sub.2 0 to about 2 wt. % Na.sub.2 O 0 to about 2 wt. % K.sub.2 O 0 to about 2 wt. % ______________________________________

Claim 7

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead-silica glass having the following weight proportions of lead oxide and silica: ______________________________________ PbO about 63 to about 66 wt. % SiO.sub.2 about 37 to about 34 wt. % ______________________________________ and the following components in quantities based on the total quantity of lead oxide and silica: ______________________________________ Na.sub.2 O about 1 to about 2 wt. % K.sub.2 O about 2 to about 3 wt. % BaO 0 to about 2 wt. % MgO 0 to about 1 wt. % ZnO 0 to about 3 wt. % CaO 0 to about 3 wt. % ______________________________________

Claim 8

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead-silica glass having the following weight proportions of lead oxide and silica: ______________________________________ PbO about 63 to about 66 wt. % SiO.sub.2 about 37 to about 34 wt. % ______________________________________ and the following components in quantities based on the total quantity of lead oxide and silica: ______________________________________ Na.sub.2 O about 1 to about 2 wt. % K.sub.2 O about 2 to about 3 wt. % BaO 0 to about 2 wt. % MgO 0 to about 1 wt. % ZnO 0 to about 3 wt. % CaO 0 to about 3 wt. % ______________________________________

Claim 9

The seal construction of claim 4, wherein said electrically-conductive members each has a coefficient of thermal expansion exceeding that of the glass.

Claim 10

The seal construction of claim 5 wherein each of the electrically-conductive members is stainless steel having a coefficient of thermal expansion of about 180 to about 220 × 10 - 7 in/in/° C.

Claim 11

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead silica glass having the following relative proportions of lead oxide and silica: ______________________________________ PbO about 60 to about 80 wt. % SiO.sub.2 about 40 to about 20 wt. % ______________________________________ and the following additional components in quantities based on the total weight of lead oxide and silica: ______________________________________ BaO about 2 to about 14 wt. % MgO 0 to about 2 wt. % ZnO 0 to about 3 wt. % CaO 0 to about 3 wt. % ______________________________________

Claim 12

A seal construction comprising an inner electrically-conductive member, an outer electrically-conductive member and a glass sealingly joining said electrically-conductive members, said glass being formed from a boron- and cobalt-free lead silica glass having the following relative proportions of lead oxide and silica: ______________________________________ PbO about 60 to about 80 wt. % SiO.sub.2 about 40 to about 20 wt. % ______________________________________ and the following additional components in quantities based on the total weight of lead oxide and silica: ______________________________________ BaO about 2 to about 14 wt. % MgO 0 to about 2 wt. % ZnO 0 to about 3 wt. % CaO 0 to about 3 wt. % ______________________________________

Claim 13

The seal construction of claim 7, wherein said electrically-conductive members each has a coefficient of thermal expansion exceeding that of the glass.

Claim 14

The seal construction of claim 8, wherein each of the electrically-conductive members is stainless steel having a coefficient of thermal expansion of about 180 to about 220 × 10 - 7 in./in./° C.