US4798681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent quartz glass, method of preparing such a glass and luminescent screen provided with such a glass
Assignee: US Philips Corp
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Filing: 1987-10-07
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Granted: 1989-01-17
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Expires: 2007-10-07
Abstract
Abstract Luminescent quartz glass comprising as a glass matrix oxide mainly SiO 2 and furthermore per mole of SiO 2 from 0 to 0.15 mol of at least one of the oxides Al 2 O 3 , B 2 O 3 , P 2 O 5 , ZrO 2 , Sc 2 O 3 , Y 2 O 3 , La 2 O 3 , Gd 2 O 3 , Lu 2 O 3 , the alkali metal oxides and the alkaline earth metal oxides. The glass comprises as an activator oxide at least one of the oxides Tb 2 O 3 and Ce 2 O 3 in a quantity of 0.75 to 15 mol % calculated with respect to the glass matrix oxides. In one embodiment the glass comprises Tb 2 O 3 and also not more than 0.2 mol % of Eu 2 O 3 as an activator oxide. The glasses are preferably obtained by a sol-gel technique and are useful, for example, in luminescent screen of low-pressure mercury vapor discharge lamps.
Inventors
- 👤 Gerrit Oversluizen
- 👤 Joseph G. Van Lierop
- 👤 Anne-Marie A. Van Dongen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:23
CPC Classifications
H; H01; H01J; H01J63/00; H01J63/02; H01J63/04; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/00; C03C4/12; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/77744; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A luminescent quartz glass activated by a rare earth metal and consisting essentially of glass matrix oxides: SiO 2 and from 0 to 0.15 mol of MO per mol of SiO 2 in which MO represents at least one of the oxides selected from the group consists of Al 2 O 3 , B 2 O 3 , P 2 O 5 , ZrO 2 , Sc 2 O 3 , Y 2 O 3 , La 2 O 3 , Gd 2 O 3 , Lu 2 O 3 , the alkali metal oxides and the alkaline earth metal oxides, characterized in that the glass further consists essentially of at least one of the oxides selected from the group consisting of Tb 2 O 3 and Ce 2 O 3 as activator oxides in a quantity of 1 to 15 mol% calculated with respect to the glass matrix oxides.
Claim 2
Dependent Claim
150 words
A luminescent quartz glass activated by a rare earth metal and consisting essentially of glass matrix oxides: SiO 2 and from 0 to 0.15 mol of MO per mol of SiO 2 in which MO represents at least one of the oxides selected from the group consists of Al 2 O 3 , B 2 O 3 , P 2 O 5 , ZrO 2 , Sc 2 O 3 , Y 2 O 3 , La 2 O 3 , Gd 2 O 3 , Lu 2 O 3 , the alkali metal oxides and the alkaline earth metal oxides, characterized in that the glass further consists essentially of at least one of the oxides selected from the group consisting of Tb 2 O 3 and Ce 2 O 3 as activator oxides in a quantity of 1 to 15 mol% calculated with respect to the glass matrix oxides.
Claim 3
Dependent Claim
26 words
A luminescent quartz glass as claimed in claim 1 in which Tb 2 O 3 and/or Ce 2 O 3 are present up to 7 mol%.
Claim 4
Dependent Claim
41 words
A luminescent quartz glass as claimed in claim 1, characterized in that the glass further consists essentially of from 0.5 to 5 mol of Al 2 O 3 per mol of Tb 2 O 3 and/or Ce 2 O 3 .
Claim 5
Dependent Claim
43 words
A luminescent quartz glass as claimed in claim 1, characterized in that the glass furthermore consists essentially of Eu 2 O 3 as an activator oxide in a quantity of not more than 0.2 mol% calculated with respect to the glass matrix oxides.
Claim 6
Dependent Claim
30 words
A luminescent quartz glass as claimed in claim 4 in which MO is present in the amount of up to 0.01 mol of MO per mol of SiO 2 .
Claim 7
Dependent Claim
36 words
A luminescent quartz glass as claimed in claim 4 in which Tb 2 O 3 is present from 2 to 7 mol % and Eu 2 O 3 is present from 0.001 to 0.05 mol %.
Claim 8
Dependent Claim
18 words
A luminescent screen provided with a luminescent layer comprising a luminescent quartz glass as claimed in claim 1.
References Cited (Backward Citations)
US3527711A
Cited
US4361779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |