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1. (WO2012128729) GAS DISCHARGE TUBE WITH A METAL BODY FOR HIGH-CURRENT SURGES
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Patent claims

1. A gas discharge tube with a metal body for high-current surges consists of an external body (1) that is simultaneously an external electrode, a central electrode consisting of an internal part (3) and an external part (4), an insulating element (5), an insulating element (6), graphite paths (8) and a mixture (7) of gases in the interior of the discharge tube, characterised in that in the interior of a part ( b) of the body (1) there is arranged a cylindrical shield (2), which houses about one third of the internal part (3) of the central electrode; that a narrower external part (4) of the central electrode protrudes through the insulating element (5) and the insulating element (6); that the insulating element (5 and/or 6) is provided with a coating of graphite conductive paths (8) having a thickness only about one micrometre or less; that the graphite path (8) is shaped approximately like a capital letter J; that the insulating element (6) is shaped like a plate with a hole, where the plate does not extend to the external electrode (1); that the shield function of the arc is thus provided for in order to protect the graphite coating on the insulating element (5).

2. The gas discharge tube with a metal body for high-current surges, characterised in that the insulating element (5a) has a narrow higher section (5a1) over the entire circumference and a graphite path (8a) is arranged over a surface (5a") in order to ensure a function of shielding.

3. The gas discharge tube with a metal body for high-current surges, characterised in that the insulating element (5b) has a narrow section (5b1) over the entire circumference and a graphite coating (8b) is arranged over a surface (5b") in order to ensure a function of shielding.

4. The gas discharge tube with a metal body for high-current surges, characterised in that the insulating element (5c) has a recess (5c') over the

entire circumference and a graphite path (8c) is arranged in said recess in order to ensure a function of shielding.

5. The gas discharge tube with a metal body for high-current surges according to claims 1 to 4, characterised in that the graphite coating is also applied onto the secondary insulating element.

6. The gas discharge tube with a metal body for high-current surges according to claims 1 to 5, characterised in that a part of the application of the graphite paths being closest to the central electrode must be applied in tangential direction with respect to the contact point of the central electrode with the insulating element (5).

7. The gas discharge tube with a metal body for high-current surges according to claims 1 to 5, characterised in that one portion of the coating of the graphite paths closest to the external electrode must be applied onto a portion of or the entire circular line, which has the same centre as the circular line delimiting a contact point of the external electrode (1) with the insulating element (5).

8. The gas discharge tube with a metal body for high-current surges according to claims 1 to 5, characterised in that the graphite coating is in contact with the external electrode in a way not to be simultaneously in contact with the internal electrode.

9. The gas discharge tube with a metal body for high-current surges according to claims 1 to 5, characterised in that the graphite coating is in contact with the internal electrode in a way not to be simultaneously in contact with the external electrode.

10. The gas discharge tube with a metal body for high-current surges according to claims 1 to 5, characterised in that the secondary insulating element has a rounded edge at its external circumference at the contact point with the primary element.

11.The gas discharge tube with a metal body for high-current surges according to claims 1 to 10, characterised in that it is provided in its interior with a shield (2) made of a high-temperature resistant material of molybdenum or tungsten- copper, where the tungsten share amounts to at least 10 %.

12. The gas discharge tube with a metal body for high-current surges according to claims 1 to 10, characterised in that the internal part (3) of the central electrode is made of a high-temperature resistant material of molybdenum or tungsten-copper, where the tungsten share amounts to at least 10 %.

13. The gas discharge tube according to claims 1 to 10, characterised in that the external part (4) of the central electrode is made of a material containing predominantly copper.