US4906597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solarization-stable ultraviolet filter glasses for the 280 - 500 nm transmission range
Assignee: Schott AG
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Filing: 1988-04-08
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Granted: 1990-03-06
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Expires: 2008-04-08
Abstract
Abstract Alkali silicate glasses, pigmented with Co2+ or with Co2+ and Ni2+, and having the composition: -SiO2 52-71% by weight -PbO 2.9-16.8% by weight -SnO2 0.1-1.65% by weight -Na2O 6.7-16.7% by weight -K2O 0.5-9.9% by weight -Na2O + K2O 13.3-18.3% by weight -NiO + CoO 0.1-4.4% by weight -As2O3 + Sb2O3 0.05-0.5% by weight - SIGMA RO 0-8.6% by weight -B2O3 0-8.5% by weight -Al2O3 0-0.55% by weight -ZnO 0-10.5% by weight, - in which R is Mg, Ca, Sr, Ba or a combination thereof, are disclosed. The alkali silicate glasses of the invention are useful as optical filter glasses.
Inventors
- 👤 Burkhard Speit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:00
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/226; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/102; C03C3/105; C03C3/108; C03C4/00; C03C4/08; C03C4/085; G02B1/00; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905; Y10S65/00; Y10S65/15; Y10S65/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
An alkali silicate solarization-stable ultraviolet glass, transmitting in the 280-500 nm range, for use as an optical filter glass, said alkali silicate glass being colored with a member selected from the group consisting of Co 2+ and (Co 2+ and Ni 2+ ), consisting essentially of: ______________________________________
SiO.sub.2 52-71% by weight
PbO 2.9-16.8% by weight
SnO.sub.2 0.1-1.65% by weight
Na.sub.2 O 6.7-16.7% by weight
K.sub.2 O 0.5-9.9% by weight
Na.sub.2 O + K.sub.2 O
13.3-18.3% by weight
NiO + CoO 0.1-4.4% by weight
As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3
0.05-0.5% by weight
RO 0-8.6% by weight
B.sub.2 O.sub.3 0-8.5% by weight
Al.sub.2 O.sub.3 0-0.55% by weight
ZnO 0-10.5% by weight
______________________________________ wherein, R is an element selected from the group consisting of Mg, Ca, Sr, Ba and a combination thereof.
Claim 2
Dependent Claim
129 words
An alkali silicate solarization-stable ultraviolet glass, transmitting in the 280-500 nm range, for use as an optical filter glass, said alkali silicate glass being colored with a member selected from the group consisting of Co 2+ and (Co 2+ and Ni 2+ ), consisting essentially of: ______________________________________
SiO.sub.2 52-71% by weight
PbO 2.9-16.8% by weight
SnO.sub.2 0.1-1.65% by weight
Na.sub.2 O 6.7-16.7% by weight
K.sub.2 O 0.5-9.9% by weight
Na.sub.2 O + K.sub.2 O
13.3-18.3% by weight
NiO + CoO 0.1-4.4% by weight
As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3
0.05-0.5% by weight
RO 0-8.6% by weight
B.sub.2 O.sub.3 0-8.5% by weight
Al.sub.2 O.sub.3 0-0.55% by weight
ZnO 0-10.5% by weight
______________________________________ wherein, R is an element selected from the group consisting of Mg, Ca, Sr, Ba and a combination thereof.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |