Claims
- 1. A gas tube protector comprising:
- an insulating housing;
- a pair of electrodes mounted within the housing so as to form a spark gap therebetween; and
- a coating formed on a surface of at least one electrode adjacent to the gap, said coating comprising both barium titanate and titanium in its final form and a glass thermionic composition.
- 2. A device according to claim 1 wherein the glass thermionic composition comprises a mixture of Na.sub.2 O, BaO, B.sub.2 O.sub.3, Al.sub.2 O.sub.3 and SiO.sub.2.
- 3. A device according to claim 1 wherein the weight percent of the barium titanate is within the range 10-25, and the weight percent of the titanium is within the range 10-25, while the combined weight percent of barium titanate and titanium is within the range 20-50.
- 4. A device according to claim 1 wherein the thickness of the coating is within the range 9,000 .ANG.-12,000 .ANG..
- 5. A device according to claim 1 wherein the coating consists essentially of barium titanate, titanium, Na.sub.2 O, BaO, B.sub.2 O.sub.3, Al.sub.2 O.sub.3 and SiO.sub.2.
- 6. A device according to claim 1 further comprising a third electrode mounted within the housing and forming a second spark gap with one of the two electrodes.
- 7. A device according to claim 1 wherein the DC breakdown voltage is within the range 300-400 volts.
Parent Case Info
This application is a continuation of application Ser. No. 07/813,533, filed on Dec. 26, 1991 now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2085222 |
Apr 1982 |
GBX |
2122807 |
Jan 1984 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
813553 |
Dec 1991 |
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