US Patent No: 6,534,918

Number of patents in Portfolio can not be more than 2000

High pressure discharge lamp with tungsten electrode rods having second parts with envelope of rhenium




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The high-pressure discharge lamp comprises a sealed lamp vessel (1) having a quartz glass wall (2) enclosing a discharge space (3). Metal foils (4) are embedded in the wall, connected to electrode rods (6) projecting from the wall into the discharge space. The electrode rods (6) have a first part (7a) and a second part (7b) with a diameter of between 250 and 350 .mu.m and at least an envelope (7c) made of rhenium. The second part, which is positioned within the wall (2), prevents premature failure of the lamp caused by leakage.

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Patent Owner(s)


International Classification(s)

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Inventor Name Address # of filed Patents Total Citations
Eijsermans, Joseph F R Eindhoven, NL 3 14
Jorres, Angela Julich, DE 2 2
Kubon, Marcus Aachen, DE 7 44
Peterek, Manfred Aachen, DE 3 35
Seebode, Dorothea Aachen, DE 3 5

Cited Art Landscape

Patent Info (Count) # Cites Year
Other [Check patent profile for assignment information] (8)
* 4,413,205 Halogen incandescent lamp with internal current conductors of tungsten-rhenium alloy 9 1981
* 5,004,951 Single side-sealed metal vapor discharge lamp 9 1990
* 5,585,694 Low pressure discharge lamp having sintered "cold cathode" discharge electrodes 23 1992
* 5,461,277 High-pressure gas discharge lamp having a seal with a cylindrical crack about the electrode rod 13 1992
* 5,510,675 Flicker-suppressed, low-power, high-pressure discharge lamp 4 1993
* 5,568,008 Metal halide lamp with a one-part arrangement of a front cover and a reflector 8 1995
* 6,060,829 Metal halide lamp with rhenium skin on tungsten electrode 16 1998
* 6,169,365 High-pressure metal halide lamp having three part electrode rods 13 1998
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
Other [Check patent profile for assignment information] (2)
* 6,646,380 High-pressure gas discharge lamp 3 2000
* 2006/0214,588 High-pressure discharge lamp 0 2006
* Cited By Examiner