US5961883A
Expired / Lapsed
US
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Oxide fluorescent glass capable of exhibiting visible fluorescence
Assignee: Sumita Optical Glass Inc
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Filing: 1997-12-11
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Granted: 1999-10-05
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Expires: 2017-12-11
Abstract
Abstract A glass material is provided which is capable of exhibiting fluorescence in the visible region by ultraviolet ray excitation. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %): - SiO2 2 to 60%, - B2O3 5 to 70% (SiO2 + B2O3 = 50 to 70%) - RO 5 to 30% (R: at least one atom selected from Mg, Ca, - Sr and Ba) - ZnO 0 to 15% - ZrO2 0 to 10%, - Tb2O3 or Eu2O3 2 to 15% (containing either of Tb2O3 or Eu2O3) - Ln2O3 0 to 20% (Ln: at least one atom selected from Y, La, - Gd, Yb, Lu, Sm, Dy and Tm) - CeO2 0 to 1% - Bi2O3 0 to 2% - Sb2O3 0.01 to 0.5% and - R'2O 0 to 20% (R': at least one atom selected from Li, Na - and K) -
Inventors
- 👤 Masaaki Yamazaki
- 👤 Masaaki Otsuka
- 👤 Hideaki Takaku
- 👤 Naruhito Sawanobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:37
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C4/00; C03C4/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
An oxide fluorescent glass capable of exhibiting visible fluorescence, which is represented by the following chemical composition consisting essentially of: ______________________________________
SiO.sub.2 5 to 50 mol %,
B.sub.2 O.sub.3
10 to 60 mol %, (SiO.sub.2 + B.sub.2 O.sub.3 = 50 to 65 mol %)
RO 15 to 25 mol % (R: at least one element selected from
Mg, Ca, Sr and Ba)
ZnO 0 to 10 mol %
ZrO.sub.2 0 to 4 mol %,
Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3
2.1 to 11.3 mol %
Ln.sub.2 O.sub.2
0 to 10 mol % (Ln: at least one element selected from
Y, La, Gd, Yb, Lu, Sm, Dy and Tm)
CeO.sub.2 0 to 0.2 mol %
Bi.sub.2 O.sub.3
0 to 1 mol %
Sb.sub.2 O.sub.3
0.02 to 0.2 mol % and
R'.sub.2 O
0 to 15 mol % (R': at least one element selected from
Li, Na and K).
______________________________________
Claim 2
Dependent Claim
147 words
An oxide fluorescent glass capable of exhibiting visible fluorescence, which is represented by the following chemical composition consisting essentially of: ______________________________________
SiO.sub.2 5 to 50 mol %,
B.sub.2 O.sub.3
10 to 60 mol %, (SiO.sub.2 + B.sub.2 O.sub.3 = 50 to 65 mol %)
RO 15 to 25 mol % (R: at least one element selected from
Mg, Ca, Sr and Ba)
ZnO 0 to 10 mol %
ZrO.sub.2 0 to 4 mol %,
Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3
2.1 to 11.3 mol %
Ln.sub.2 O.sub.2
0 to 10 mol % (Ln: at least one element selected from
Y, La, Gd, Yb, Lu, Sm, Dy and Tm)
CeO.sub.2 0 to 0.2 mol %
Bi.sub.2 O.sub.3
0 to 1 mol %
Sb.sub.2 O.sub.3
0.02 to 0.2 mol % and
R'.sub.2 O
0 to 15 mol % (R': at least one element selected from
Li, Na and K).
______________________________________
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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) | 2002-10-04 | 2003-04-05 | 2003-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-04 | 2007-04-05 | 2007-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-04 | 2011-04-05 | 2011-10-05 | $7700.00 | Window Closed / Lapsed |