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US4065697A
Expired / Lapsed
US
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Cathode-ray tube
Assignee: Techneglas LLC
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Filing: 1969-02-17
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Granted: 1977-12-27
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Expires: 1989-02-17
Abstract
Abstract A cathode-ray tube, such as a color television tube, formed from a glass containing up to 20 percent by weight of strontium oxide as an essential ingredient thereof, which tube has imparted thereto improved X-ray absorbing properties without any material increase in the X-ray and electron browning of the glass.
Inventors
- 👤 Bernard L. Steierman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:11
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/083; C03C3/085; C03C3/087; C03C3/102; C03C3/105; C03C4/00; C03C4/08; C03C4/087; H01J29/86; H01J29/863
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A cathode-ray tube comprising a glass funnel portion, glass faceplate sealed thereto, a fluorescent screen on the inner surface of said faceplate, and an electron gun disposed within said sealed tube, at least said faceplate being formed from a soda-potash-barium or a soda-potash-lead-barium glass, said glass containing cerium oxide in an amount not exceeding 1 weight percent to protect against X-ray browning and also containing as an essential ingredient up to 20 weight percent SrO, sufficient to impart improved absorption of X-radiation emitted from within the tube in the range of wavelengths between about 0.5 and 0.7A, said glass having a fiber softening point of from about 625° to about 700° C and an annealing point of from about 425° to about 525° C.
Claim 2
Dependent Claim
124 words
A cathode-ray tube comprising a glass funnel portion, glass faceplate sealed thereto, a fluorescent screen on the inner surface of said faceplate, and an electron gun disposed within said sealed tube, at least said faceplate being formed from a soda-potash-barium or a soda-potash-lead-barium glass, said glass containing cerium oxide in an amount not exceeding 1 weight percent to protect against X-ray browning and also containing as an essential ingredient up to 20 weight percent SrO, sufficient to impart improved absorption of X-radiation emitted from within the tube in the range of wavelengths between about 0.5 and 0.7A, said glass having a fiber softening point of from about 625° to about 700° C and an annealing point of from about 425° to about 525° C.
Claim 3
Dependent Claim
16 words
A cathode-ray tube of claim 1 wherein said glass contains up to 15 weight percent SrO.
Claim 4
Dependent Claim
14 words
A cathode-ray tube of claim 1 wherein said glass contains 2-10 weight percent SrO.
Claim 5
Dependent Claim
117 words
A cathode-ray tube of claim 2 wherein said glass consists essentially of the following components in addition to SrO and cerium oxide: ______________________________________
Component Weight Percent
______________________________________
SiO.sub.2 50 - 70
Na.sub.2 O 3 - 10
K.sub.2 O 5 - 15
Al.sub.2 O.sub.3
3 - 5
CaO 1 - 5
BaO 0.1 - 20
MgO 0.1 - 3
F.sub.2 0 - 2
PbO 0.1 - 5
______________________________________ and contains no more than 2 percent Li 2 O, 2 percent MnO, 1 percent Sb 2 O 3 , 1 percent rare earths, and has a fiber softening point of from about 625° to about 700° C and an annealing point of from about 425° to about 525° C.
Claim 6
Dependent Claim
14 words
A cathode-ray tube of claim 4 wherein said glass contains 2-10 weight percent SrO.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |