US4483931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead gallate glasses
Assignee: Corning Glass Works
•
Filing: 1983-03-21
•
Granted: 1984-11-20
•
Expires: 2003-03-21
Abstract
Abstract This invention is directed to the preparation of glasses in the PbO--Ga 2 O 3 field exhibiting good infrared transmitting characteristics out to wavelengths of 8 microns. The binary glasses consist essentially, by weight, of about 15-28% Ga 2 O 3 and 72-85% PbO. However, the preferred glasses contain up to 85% Bi 2 O 3 and consist essentially as included within the area generally encompassed by the curve in FIG. 2.
Inventors
- 👤 William H. Dumbaugh, Jr.
- 👤 Brian P. Tyndell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:28
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/10; C03C3/00; C03C3/12; C03C3/122; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A stable binary glass exhibiting refractive indices greater than 2.4 and infrared transmitting characteristics out to wavelengths of 8 microns consisting, expressed in terms of weight percent on the oxide basis, of about 15-28% Ga 2 O 3 and 72-85% PbO.
Claim 2
Dependent Claim
41 words
A stable binary glass exhibiting refractive indices greater than 2.4 and infrared transmitting characteristics out to wavelengths of 8 microns consisting, expressed in terms of weight percent on the oxide basis, of about 15-28% Ga 2 O 3 and 72-85% PbO.
Claim 3
Dependent Claim
59 words
A stable ternary glass exhibiting infrared transmitting characteristics out to 8 microns consisting essentially, expressed in terms of weight percent on the oxide basis, as included within the area generally encompassed by the curve in FIG. 2 of about 10-85% PbO, 5-30% Ga 2 O 3 , and including Bi 2 O 3 in amounts not more than 85%.
Claim 4
Dependent Claim
59 words
A stable ternary glass exhibiting infrared transmitting characteristics out to 8 microns consisting essentially, expressed in terms of weight percent on the oxide basis, as included within the area generally encompassed by the curve in FIG. 2 of about 10-85% PbO, 5-30% Ga 2 O 3 , and including Bi 2 O 3 in amounts not more than 85%.
Claim 5
Dependent Claim
84 words
An infrared transmitting glass according to claim 2 also containing up to 30% total of the following components in the indicated proportions selected from the group of: ______________________________________
Cs.sub.2 O
0-20 Rb.sub.2 O
0-5
HgO 0-30 HfO.sub.2
0-5
Tl.sub.2 O.sub.3
0-20 Al.sub.2 O.sub.3
0-3
Sb.sub.2 O.sub.3
0-10 ZnO 0-5
TeO.sub.2
0-10 K.sub.2 O
0-2
Cr.sub.2 O.sub.3
0-5 In.sub.2 O.sub.3
0-10
MnO.sub.2
0-5 SiO.sub.2
0-2
CuO 0-2 ZrO.sub.2
0-5
CdO 0-12 Nb.sub.2 O.sub.5
0-5
GeO.sub.2
0-5 Ta.sub.2 O.sub.5
0-5
Na.sub.2 O
0-2 Halogen 0-5
______________________________________
Claim 6
Dependent Claim
13 words
An infrared transmitting glass according to claim 3 wherein said halogen is chloride.
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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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |