US5631522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low sodium permeability glass
Assignee: General Electric Co
•
Filing: 1995-05-09
•
Granted: 1997-05-20
•
Expires: 2015-05-09
Abstract
Abstract A glass composition, particularly well suited for use in constructing sodium containing lamp envelopes. The glass composition is comprised of silica doped with yttrium and/or cesium, preferably in combination aluminum.
Inventors
- 👤 Curtis E. Scott
- 👤 Mohan Rajaram
- 👤 Joseph A. Shrawder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:18
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/302; C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/34; C03C2201/36; C03C2201/40; H01J61/82; H01J61/825
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
66 words
A lamp having a filament or arc discharge light source surrounded by an envelope wherein the improvement comprises said envelope being comprised of SiO 2 containing at least about 10 ppm by weight of a first element selected from the group consisting of aluminum in an amount less than 10,000 ppm, lanthanum, dysprosium, niobium, erbium, and mixtures thereof, and at least one of yttrium and cesium.
Claim 2
Dependent Claim
66 words
A lamp having a filament or arc discharge light source surrounded by an envelope wherein the improvement comprises said envelope being comprised of SiO 2 containing at least about 10 ppm by weight of a first element selected from the group consisting of aluminum in an amount less than 10,000 ppm, lanthanum, dysprosium, niobium, erbium, and mixtures thereof, and at least one of yttrium and cesium.
Claim 3
Dependent Claim
35 words
The lamp of claim 1 wherein said envelope is comprised of between about 20 and about 1000 ppm by weight of said first element and between about 10 and about 1000 ppm by weight yttrium.
Claim 4
Dependent Claim
35 words
The lamp of claim 2 wherein said envelope is comprised of between about 20 and about 500 ppm by weight of said first oxide and between about 20 and about 500 ppm by weight yttrium.
Claim 5
Dependent Claim
33 words
The lamp of claim 1 wherein said envelope is comprised of between about 20 and about 1000 ppm by weight of said first element and between about 10 and about 1000 ppm cesium.
Claim 6
Dependent Claim
35 words
The lamp of claim 4 wherein said envelope is comprised of between about 20 and about 200 ppm by weight of said first element and between about 20 and about 500 ppm by weight cesium.
Claim 7
Dependent Claim
23 words
The lamp of claim 1 wherein said first element, said cesium and said yttrium, if present, are predominantly in the form of oxides.
Claim 8
Dependent Claim
11 words
The article of claim 1, wherein said first element is aluminum.
Claim 9
Dependent Claim
24 words
The article of claim 7 further comprised of a ratio of aluminum to yttrium between about 1 to 10 and about 10 to 1.
Claim 10
Dependent Claim
19 words
The article of claim 8 wherein said ratio is between about 1 to 10 and about 1 to 1.
Claim 11
Dependent Claim
23 words
The article of claim 7 comprised of a ratio of aluminum to cesium between about 1 to 5 and about 1 to 1.
Claim 12
Dependent Claim
19 words
The article of claim 10 wherein said ratio is between about 1 to 2 and about 1 to 1.
Claim 13
Dependent Claim
49 words
A metal halide lamp having electrodes within a discharge envelope containing a fill including sodium, said envelope having substantially transparent walls comprised of SiO 2 , 10-10,000 ppm aluminum, and at least one of yttrium and cesium in a total quantity of at least about 25 ppm by weight.
Claim 14
Dependent Claim
49 words
A metal halide lamp having electrodes within a discharge envelope containing a fill including sodium, said envelope having substantially transparent walls comprised of SiO 2 , 10-10,000 ppm aluminum, and at least one of yttrium and cesium in a total quantity of at least about 25 ppm by weight.
Claim 15
Dependent Claim
30 words
The lamp of claim 12 wherein said envelope is comprised of a total quantity of at least about 50 ppm by weight of at least one of yttrium and cesium.
Claim 16
Dependent Claim
18 words
The lamp of claim 12 wherein said envelope is comprised of less than 0.1 ppm by weight sodium.
Claim 17
Dependent Claim
42 words
A glass composition comprised of beneficiated quartz, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight yttrium.
Claim 18
Dependent Claim
42 words
A glass composition comprised of beneficiated quartz, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight yttrium.
Claim 19
Dependent Claim
42 words
A glass composition comprised of synthetic silica, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight cesium.
Claim 20
Dependent Claim
42 words
A glass composition comprised of synthetic silica, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight cesium.
Claim 21
Dependent Claim
42 words
A glass composition comprised of beneficiated quartz, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight cesium.
Claim 22
Dependent Claim
42 words
A glass composition comprised of beneficiated quartz, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight cesium.
Claim 23
Dependent Claim
42 words
A glass composition comprised of synthetic silica, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight yttrium.
Claim 24
Dependent Claim
42 words
A glass composition comprised of synthetic silica, about 10 to about 1000 ppm by weight of an element selected from the group consisting of aluminum, lanthanum, dysprosium, niobium, erbium, and mixtures thereof and about 20 to about 1000 ppm by weight yttrium.
Claim 25
Dependent Claim
36 words
A metal halide lamp having electrodes within a discharge envelope containing a fill including sodium, said envelope having substantially transparent walls comprised of SiO 2 and between about 25 ppm and 10,000 ppm by weight cesium.
Claim 26
Dependent Claim
36 words
A metal halide lamp having electrodes within a discharge envelope containing a fill including sodium, said envelope having substantially transparent walls comprised of SiO 2 and between about 25 ppm and 10,000 ppm by weight cesium.
Claim 27
Dependent Claim
83 words
A lamp having a light source surrounded by an envelope, said envelope constructed predominantly of a glass comprised of: 50to 99.9 percent by weight SiO 2 0,001 to 1.0 percent by weight aluminum 0 to 1.0 percent by weight yttrium 0 to 1.0 percent by weight cesium 0 to 0.0001 percent by weight sodium 0 to 0.0001 percent by weight lithium 0 to 0.0002 percent by weight iron wherein said yttrium and cesium comprise at least 0.001 percent by weight of said glass.
Claim 28
Dependent Claim
83 words
A lamp having a light source surrounded by an envelope, said envelope constructed predominantly of a glass comprised of: 50to 99.9 percent by weight SiO 2 0,001 to 1.0 percent by weight aluminum 0 to 1.0 percent by weight yttrium 0 to 1.0 percent by weight cesium 0 to 0.0001 percent by weight sodium 0 to 0.0001 percent by weight lithium 0 to 0.0002 percent by weight iron wherein said yttrium and cesium comprise at least 0.001 percent by weight of said glass.
Claim 29
Dependent Claim
26 words
An article comprised of SiO 2 , aluminum, and at least one of yttrium and cesium having a log volume resistivity of at least about 10.50.
Claim 30
Dependent Claim
26 words
An article comprised of SiO 2 , aluminum, and at least one of yttrium and cesium having a log volume resistivity of at least about 10.50.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-19 | 2000-11-18 | 2001-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-19 | 2004-11-18 | 2005-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-19 | 2008-11-18 | 2009-05-20 | $7700.00 | Window Closed / Lapsed |