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
Stats
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Mar 18, 2003
Issued date -
Jun 22, 1999
filing date -
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09/338,052
serial no -
Expired
status (Note)
Importance
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Abstract
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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First Claim
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International Classification(s)
Cited Art Landscape
| Patent Info | (Count) | # Cites | Year |
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| * 5,585,694 Low pressure discharge lamp having sintered "cold cathode" discharge electrodes | 23 | 1992 | |
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| * 4,413,205 Halogen incandescent lamp with internal current conductors of tungsten-rhenium alloy | 9 | 1981 | |
| * 5,461,277 High-pressure gas discharge lamp having a seal with a cylindrical crack about the electrode rod | 13 | 1992 | |
| * 6,060,829 Metal halide lamp with rhenium skin on tungsten electrode | 15 | 1998 | |
| * 6,169,365 High-pressure metal halide lamp having three part electrode rods | 13 | 1998 | |
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| * 5,568,008 Metal halide lamp with a one-part arrangement of a front cover and a reflector | 8 | 1995 | |
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| * 5,004,951 Single side-sealed metal vapor discharge lamp | 9 | 1990 | |
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| * 5,510,675 Flicker-suppressed, low-power, high-pressure discharge lamp | 4 | 1993 | |
* Cited By Examiner
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 18, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |