Patent US3987330A successfully refreshed from Google Patents.
US3987330A
Expired / Lapsed
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Zirconia containing glass compositions for cathode ray tubes
Assignee: OI Glass Inc
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Filing: 1975-04-25
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Granted: 1976-10-19
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Expires: 1995-04-25
Abstract
Abstract Disclosed are glass compositions containing specified critical proportions of ZrO2, PbO, BaO, and SrO, to achieve X-ray absorption, resistance to devitrification and other glass forming properties which render them particularly suited for the manufacture of faceplates for cathode ray tubes for color television applications.
Inventors
- 👤 James A. Shell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:56
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C4/00; C03C4/08; C03C4/087
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A homogeneous, optically uniform, devitrification resistant, X-ray absorbing glass composition having a liquidus temperature below about 1650° F, a Linear Absorption Coefficient of at least 27/cm at 0.6A, said composition consisting essentially of: ______________________________________
Component Percent 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 5 - 10
MgO 0 - 2
CaO + MgO 2 - 10
SrO 4 - 10
BaO 1 - 5
PbO 1 - 5
ZrO.sub.2 0.5 - 5
______________________________________
Claim 2
Dependent Claim
85 words
A homogeneous, optically uniform, devitrification resistant, X-ray absorbing glass composition having a liquidus temperature below about 1650° F, a Linear Absorption Coefficient of at least 27/cm at 0.6A, said composition consisting essentially of: ______________________________________
Component Percent 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 5 - 10
MgO 0 - 2
CaO + MgO 2 - 10
SrO 4 - 10
BaO 1 - 5
PbO 1 - 5
ZrO.sub.2 0.5 - 5
______________________________________
Claim 3
Dependent Claim
15 words
The glass composition of claim 1 wherein said SrO is in the range of 6-10%.
Claim 4
Dependent Claim
19 words
The glass composition of claim 1 wherein said ZrO 2 is in the range of about 1 to 3%.
Claim 5
Dependent Claim
48 words
In a cathode ray tube comprising a glass funnel, a glass faceplate sealed to said funnel and an electron gun disposed within said funnel, said faceplate having the property of absorbing X-ray emitted from within said tube; the improvement wherein said faceplate has the composition of claim 1.
Claim 6
Dependent Claim
48 words
In a cathode ray tube comprising a glass funnel a glass faceplate sealed to said funnel and an electron gun disposed within said funnel said faceplate having the property of absorbing X-ray emitted from within said tube; the improvement wherein said faceplate has the composition of claim 2.
Claim 7
Dependent Claim
48 words
In a cathode ray tube comprising a glass funnel a glass faceplate sealed to said funnel and an electron gun disposed within said funnel said faceplate having the property of absorbing X-ray emitted from within said tube; the improvement wherein said faceplate has the composition of claim 3.
Claim 8
Dependent Claim
19 words
As an article of manufacture a glass faceplate for a cathode ray tube having the composition of claim 1.
Claim 9
Dependent Claim
19 words
As an article of manufacture a glass faceplate for a cathode ray tube having the composition of claim 2.
Claim 10
Dependent Claim
19 words
As an article of manufacture a glass faceplate for a cathode ray tube having the composition of claim 3.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |