Patent US2418562A successfully refreshed from Google Patents.
US4385128A
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Germanium-containing glass of high infrared transmission and low density
Assignee: Corning Glass Works
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Filing: 1981-12-30
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Granted: 1983-05-24
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Expires: 2001-12-30
Abstract
Abstract This invention is directed to the production of glasses having a density of less than 3.26 g/cm 3 , a β OH value less than 0.030 mm -1 , and, in a thickness of 2 mm, a transmission of at least about 80% at a wavelength of 4.0 microns and at least about 50% at a wavelength of 5 microns, which have base compositions within the alkali metal oxide-CaO-Al 2 O 3 -GeO 2 -F and/or Cl field consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ GeO 2 36-55 Al 2 O 3 18-31 CaO 10-25 Li 2 O 0-5 K 2 O and/or Na 2 O and/or Li 2 O 7-20 Al 2 O 3 + 1.5 (K 2 O and/or Na 2 O and/or Li 2 ≧40 F and/or Cl 0.1-4. ______________________________________
Inventors
- 👤 Jean E. Boudot
- 👤 Jean P. Mazeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:45
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/253; C03C4/00; C03C4/10; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904; Y10S65/00; Y10S65/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
203 words
A glass having a density less than 3.26 g/cm 3 , a β OH value less than 0.03 mm -1 , and, in a thickness of 2 mm, a transmission of at least about 80% at a wavelength of 4.0 microns and at least about 50% at a wavelength of 5 microns, which consists essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________
GeO.sub.2 36-55%
Al.sub.2 O.sub.3 18-31%
CaO 0-25%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
7-20%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2
≧40%
F and/or Cl 0.1-4%
MgO and/or ZnO and/or ZrO.sub.2
0-4%
TiO.sub.2 and/or PbO and/or CdO and/or La.sub.2 O.sub.3 and/or
Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.5 and/or Y.sub.2 O.sub.3 and/or
Gd.sub.2 O.sub.3 0-6%
BaO 0-8%
SrO 0-10%
MgO + ZnO + ZrO.sub.2 + TiO.sub.2 + PbO + CdO +
La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3
+ Gd.sub.2 O.sub.3 +
BaO + SrO 0-10%
CaO + SrO or at least 4.5% CaO + MgO + ZnO +
ZrO.sub.2 + TiO.sub.2 + PbO + CdO + La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 +
Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 + BaO
10-25%.
______________________________________
Claim 2
Dependent Claim
203 words
A glass having a density less than 3.26 g/cm 3 , a β OH value less than 0.03 mm -1 , and, in a thickness of 2 mm, a transmission of at least about 80% at a wavelength of 4.0 microns and at least about 50% at a wavelength of 5 microns, which consists essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________
GeO.sub.2 36-55%
Al.sub.2 O.sub.3 18-31%
CaO 0-25%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
7-20%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2
≧40%
F and/or Cl 0.1-4%
MgO and/or ZnO and/or ZrO.sub.2
0-4%
TiO.sub.2 and/or PbO and/or CdO and/or La.sub.2 O.sub.3 and/or
Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.5 and/or Y.sub.2 O.sub.3 and/or
Gd.sub.2 O.sub.3 0-6%
BaO 0-8%
SrO 0-10%
MgO + ZnO + ZrO.sub.2 + TiO.sub.2 + PbO + CdO +
La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3
+ Gd.sub.2 O.sub.3 +
BaO + SrO 0-10%
CaO + SrO or at least 4.5% CaO + MgO + ZnO +
ZrO.sub.2 + TiO.sub.2 + PbO + CdO + La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 +
Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 + BaO
10-25%.
______________________________________
Claim 3
Dependent Claim
47 words
A glass according to claim 1 consisting essentially of ______________________________________
GeO.sub.2 36-55%
Al.sub.2 O.sub.3 18-31%
CaO 10-25%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
7-20%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or Na.sub.2 O
and/or Li.sub.2 O) ≧40%
F and/or Cl 0.1-4%.
______________________________________
Claim 4
Dependent Claim
45 words
A glass according to claim 2 consisting essentially of ______________________________________
GeO.sub.2 40-50%
Al.sub.2 O.sub.3 22-28%
CaO 12-17%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
11-17%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or
Na.sub.2 O and/or Li.sub.2 O)
≧40%
F 0.3-3%.
______________________________________
Claim 5
Independent Claim
280 words
A method for making a glass having a density less than 3.26 g/cm 3 , a β OH value less than 0.03 mm -1 , and, in a thickness of 2 mm, a transmission of at least about 80% at a wavelength of 4.0 microns and at least about 50% at a wavelength of 5 microns, which comprises the steps of: (a) preparing and mixing a batch to yield a glass consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________
GeO.sub.2 36-55%
Al.sub.2 O.sub.3 18-31%
CaO 0-25%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
7-20%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2
≧40%
F and/or Cl 0.1-4%
MgO and/or ZnO and/or ZrO.sub.2
0-4%
TiO.sub.2 and/or PbO and/or CdO and/or La.sub.2 O.sub.3 and/or
Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.5 and/or Y.sub.2 O.sub.3 and/or
Gd.sub.2 O.sub.3 0-6%
BaO 0-8%
SrO 0-10%
MgO + ZnO + ZrO.sub.2 + TiO.sub.2 + PbO + CdO +
La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3
+ Gd.sub.2 O.sub.3 +
BaO + SrO 0-10%
CaO + SrO or at least 4.5% CaO + MgO +
ZnO + ZrO.sub.2 + TiO.sub.2 + PbO + CdO + La.sub.2 O.sub.3 +
Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3
+ BaO 10-25%
______________________________________ wherein F and/or Cl are incorporated into said batch as a fluorine and/or chlorine-containing compound in an amount equal to 1-4% F and/or 2-5% Cl; (b) melting said batch while maintaining a dry gas atmosphere on the surface of the melt and bubbling a dry gas through the melt; and then (c) forming said melt into a glass article.
Claim 6
Independent Claim
280 words
A method for making a glass having a density less than 3.26 g/cm 3 , a β OH value less than 0.03 mm -1 , and, in a thickness of 2 mm, a transmission of at least about 80% at a wavelength of 4.0 microns and at least about 50% at a wavelength of 5 microns, which comprises the steps of: (a) preparing and mixing a batch to yield a glass consisting essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________
GeO.sub.2 36-55%
Al.sub.2 O.sub.3 18-31%
CaO 0-25%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
7-20%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2
≧40%
F and/or Cl 0.1-4%
MgO and/or ZnO and/or ZrO.sub.2
0-4%
TiO.sub.2 and/or PbO and/or CdO and/or La.sub.2 O.sub.3 and/or
Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.5 and/or Y.sub.2 O.sub.3 and/or
Gd.sub.2 O.sub.3 0-6%
BaO 0-8%
SrO 0-10%
MgO + ZnO + ZrO.sub.2 + TiO.sub.2 + PbO + CdO +
La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3
+ Gd.sub.2 O.sub.3 +
BaO + SrO 0-10%
CaO + SrO or at least 4.5% CaO + MgO +
ZnO + ZrO.sub.2 + TiO.sub.2 + PbO + CdO + La.sub.2 O.sub.3 +
Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3
+ BaO 10-25%
______________________________________ wherein F and/or Cl are incorporated into said batch as a fluorine and/or chlorine-containing compound in an amount equal to 1-4% F and/or 2-5% Cl; (b) melting said batch while maintaining a dry gas atmosphere on the surface of the melt and bubbling a dry gas through the melt; and then (c) forming said melt into a glass article.
Claim 7
Dependent Claim
50 words
A method according to claim 4 wherein said glass consists essentially of ______________________________________
GeO.sub.2 36-55%
Al.sub.2 O.sub.3 18-31%
CaO 10-25%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
7-20%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or Na.sub.2 O
and/or Li.sub.2 O) ≧40%
F and/or Cl 0.1-4%.
______________________________________
Claim 8
Dependent Claim
48 words
A method according to claim 5 wherein said glass consists essentially of ______________________________________
GeO.sub.2 40-50%
Al.sub.2 O.sub.3 22-28%
CaO 12-17%
Li.sub.2 O 0-5%
K.sub.2 O and/or Na.sub.2 O and/or Li.sub.2 O
11-17%
Al.sub.2 O.sub.3 + 1.5 (K.sub.2 O and/or
Na.sub.2 O and/or Li.sub.2 O)
≧40%
F 0.3-3%.
______________________________________
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |