US4015966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of X-ray absorbing glass composition by a float glass process
Assignee: Techneglas LLC
•
Filing: 1976-06-01
•
Granted: 1977-04-05
•
Expires: 1996-06-01
Abstract
Abstract Disclosed is a technique for melting X-ray absorbing glass compositions by a process wherein molten glass is floated or supported on a bath of molten tin. The X-ray absorbing glass compositions are free of the oxides of lead, arsenic, antimony, bismuth, cadmium, and other readily reducible oxides to prevent discoloration of the glass upon contact with molten metal.
Inventors
- 👤 Edward A. Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:11
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C1/00; C03C1/004; C03C3/083; C03C3/085; C03C4/00; C03C4/08; C03C4/087
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
In the process for melting an X-ray absorbing glass composition having an LAC of at least about 26/cm at 0.6 A which composition is adapted for use as the faceplate of a cathode ray television tube, wherein a glass batch for said composition is melted to yield a molten glass, and the resulting molten glass is floated on a bath of molten tin, the improvement wherein said X-ray absorbing glass composition is free of the oxides of lead, antimony and arsenic and consists essentially of: ______________________________________
Component % by Weight
______________________________________
SiO.sub.2 60-65
Al.sub.2 O.sub.3 0-5
Na.sub.2 O 2-10
K.sub.2 O 0-17
CaO + MgO 2-10
BaO 0-5
SrO 5-15
ZrO.sub.2 0-10
WO.sub.3 0-5
TiO.sub.2 + CeO.sub.2
0.1-1
TiO.sub.2 0-1
CeO.sub.2 0-1
Fe.sub.2 O.sub.3 0- 1.
______________________________________
Claim 2
Dependent Claim
127 words
In the process for melting an X-ray absorbing glass composition having an LAC of at least about 26/cm at 0.6 A which composition is adapted for use as the faceplate of a cathode ray television tube, wherein a glass batch for said composition is melted to yield a molten glass, and the resulting molten glass is floated on a bath of molten tin, the improvement wherein said X-ray absorbing glass composition is free of the oxides of lead, antimony and arsenic and consists essentially of: ______________________________________
Component % by Weight
______________________________________
SiO.sub.2 60-65
Al.sub.2 O.sub.3 0-5
Na.sub.2 O 2-10
K.sub.2 O 0-17
CaO + MgO 2-10
BaO 0-5
SrO 5-15
ZrO.sub.2 0-10
WO.sub.3 0-5
TiO.sub.2 + CeO.sub.2
0.1-1
TiO.sub.2 0-1
CeO.sub.2 0-1
Fe.sub.2 O.sub.3 0- 1.
______________________________________
Claim 3
Dependent Claim
41 words
The process of claim 1 wherein the composition consists essentially of: ______________________________________
Component % by Weight
______________________________________
SiO.sub.2 60-65
Al.sub.2 O.sub.3 0.5-5
Na.sub.2 O 5-10
K.sub.2 O 3-10
CaO + MgO 2-5
BaO 1-5
SrO 8-15
TiO.sub.2 0.1-0.6
CeO.sub.2 0.1-0.5.
______________________________________
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein said molten glass is maintained in a protective non-oxidizing atmosphere while said molten glass is being floated on said molten tin.
Claim 5
Dependent Claim
106 words
In the process for manufacturing X-ray absorbing glass having an LAC of at least about 26/cm at 0.6 A wherein said glass is cooled while being floated on a bath of molten tin to form a dimensionally stable sheet of glass therefrom the improvement wherein said X-ray absorbing glass composition is free of the oxides of lead, antimony and arsenic and consists essentially of: ______________________________________
Component % by Weight
______________________________________
SiO.sub.2 60-65
Al.sub.2 O.sub.3 0-5
Na.sub.2 O 2-10
K.sub.2 O 0-17
CaO + MgO 2-10
BaO 0-5
SrO 5-15
ZrO.sub.2 0-10
WO.sub.3 0-5
TiO.sub.2 + CeO.sub.2
0.1-1
TiO.sub.2 0-1
CeO.sub.2 0-1
Fe.sub.2 O.sub.3 0- 1.
______________________________________
Claim 6
Dependent Claim
106 words
In the process for manufacturing X-ray absorbing glass having an LAC of at least about 26/cm at 0.6 A wherein said glass is cooled while being floated on a bath of molten tin to form a dimensionally stable sheet of glass therefrom the improvement wherein said X-ray absorbing glass composition is free of the oxides of lead, antimony and arsenic and consists essentially of: ______________________________________
Component % by Weight
______________________________________
SiO.sub.2 60-65
Al.sub.2 O.sub.3 0-5
Na.sub.2 O 2-10
K.sub.2 O 0-17
CaO + MgO 2-10
BaO 0-5
SrO 5-15
ZrO.sub.2 0-10
WO.sub.3 0-5
TiO.sub.2 + CeO.sub.2
0.1-1
TiO.sub.2 0-1
CeO.sub.2 0-1
Fe.sub.2 O.sub.3 0- 1.
______________________________________
Claim 7
Dependent Claim
41 words
The process of claim 1 wherein said composition consists essentially of: ______________________________________
Component % by Weight
______________________________________
SiO.sub.2 60-65
Al.sub.2 O.sub.3 0.5-5
Na.sub.2 O 5-10
K.sub.2 O 3-10
CaO + MgO 2-5
BaO 1-5
SrO 8-15
TiO.sub.2 0.1-0.6
CeO.sub.2 0.1-0.5.
______________________________________
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |