US4873206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dark, neutral, gray, nickel-free glass composition
Assignee: PPG Industries Ohio Inc
•
Filing: 1988-07-05
•
Granted: 1989-10-10
•
Expires: 2008-07-05
Abstract
Abstract A neutral, dark gray, nickel-free, soda-lime-silica glass having luminous transmittance less than 20 percent is produced with colorants consisting essentially of 0.55 to 1.0 percent by weight total iron (at least 15 percent in the ferrous state), 0.005 to 0.02 percent CoO, and 0.003 to 0.02 percent Se. The flat glass product having such a composition is particularly suitable for use in sun roofs.
Inventors
- 👤 James V. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:11
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/02; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/083; C03C3/085; C03C3/087
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
A neutral gray colored glass composition having a base glass composition comprising: ______________________________________
SiO.sub.2 68-75 percent by weight
Na.sub.2 O 10-18
CaO 5-15
MgO 0-5
Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-5
______________________________________ and traces of melting and refining aids, if any, and colorants consisting essentially of: ______________________________________
Fe.sub.2 O.sub.3 (total iron)
0.6-1.0 percent by weight
Se 0.005-0.02
CoO 0.01-0.02
______________________________________ at least 15 percent of the iron being in the ferrous state, the glass having a luminous transmittance of no more than 20 percent and total solar energy transmittance less than 40 percent at a thickness of 0.219 inch (5.56 millimeters).
Claim 2
Dependent Claim
101 words
A neutral gray colored glass composition having a base glass composition comprising: ______________________________________
SiO.sub.2 68-75 percent by weight
Na.sub.2 O 10-18
CaO 5-15
MgO 0-5
Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-5
______________________________________ and traces of melting and refining aids, if any, and colorants consisting essentially of: ______________________________________
Fe.sub.2 O.sub.3 (total iron)
0.6-1.0 percent by weight
Se 0.005-0.02
CoO 0.01-0.02
______________________________________ at least 15 percent of the iron being in the ferrous state, the glass having a luminous transmittance of no more than 20 percent and total solar energy transmittance less than 40 percent at a thickness of 0.219 inch (5.56 millimeters).
Claim 3
Dependent Claim
30 words
The composition of claim 1 wherein the portion of the iron in the ferrous state constitutes 0.09 to 0.3 percent by weight of the total glass composition, expressed as FeO.
Claim 4
Dependent Claim
26 words
The composition of claim 1 wherein the colorant portion consists essentially of: ______________________________________
Fe.sub.2 O.sub.3 (total iron)
0.6-0.8 percent by weight
Se 0.005-0.01
CoO 0.01-0.02
______________________________________
Claim 5
Dependent Claim
30 words
The composition of claim 3 wherein the portion of the iron in the ferrous state constitutes 0.10 to 0.2 percent by weight of the total glass composition, expressed as FeO.
Claim 6
Dependent Claim
106 words
A low transmittance, neutral gray sun roof comprising a glass sheet having a base glass composition comprising: ______________________________________
SiO.sub.2 68-75 percent by weight
Na.sub.2 O 10-18
CaO 5-15
MgO 0-5
Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-5
______________________________________ and traces of melting and refining aids, if any, and colorants consisting essentially of: ______________________________________
Fe.sub.2 O.sub.3 (total iron)
0.6-1.0 percent by weight
Se 0.005-0.02
CoO 0.01-0.02
______________________________________ at least 15 percent of the iron being in the ferrous state, the glass having a luminous transmittance of no more than 20 percent and total solar energy transmittance less than 40 percent at a thickness of 0.219 inch (5.56 millimeters).
Claim 7
Dependent Claim
106 words
A low transmittance, neutral gray sun roof comprising a glass sheet having a base glass composition comprising: ______________________________________
SiO.sub.2 68-75 percent by weight
Na.sub.2 O 10-18
CaO 5-15
MgO 0-5
Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-5
______________________________________ and traces of melting and refining aids, if any, and colorants consisting essentially of: ______________________________________
Fe.sub.2 O.sub.3 (total iron)
0.6-1.0 percent by weight
Se 0.005-0.02
CoO 0.01-0.02
______________________________________ at least 15 percent of the iron being in the ferrous state, the glass having a luminous transmittance of no more than 20 percent and total solar energy transmittance less than 40 percent at a thickness of 0.219 inch (5.56 millimeters).
Claim 8
Dependent Claim
16 words
The article of claim 5 wherein the sheet has a thickness of 2 to 10 millimeters.
Claim 9
Dependent Claim
16 words
The article of claim 5 wherein the sheet has a thickness of 3 to 6 millimeters.
Claim 10
Dependent Claim
22 words
The article of claim 5 wherein a surface portion of the sheet includes at least 0.05 percent by weight SnO 2 .
Claim 11
Dependent Claim
28 words
The article of claim 5 wherein the portion of the iron in the ferrous state constitutes 0.09 to 0.3 percent by weight of the glass, expressed as FeO.
Claim 12
Dependent Claim
30 words
The article of claim 5 wherein the colorant portion of the glass sheet consists essentially of: ______________________________________
Fe.sub.2 O.sub.3 (total iron)
0.6-0.8 percent by weight
Se 0.005-0.01
CoO 0.01-0.02
______________________________________
Claim 13
Dependent Claim
28 words
The article of claim 10 wherein the portion of the iron in the ferrous state constitutes 0.10 to 0.2 percent by weight of the glass, expressed as FeO.
Claim 14
Dependent Claim
22 words
The article of claim 5 wherein the luminous transmittance is less than 15 percent at a thickness of 0.219 inch (5.56 millimeters.)
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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) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |