US4342943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
P2 O5 -V2 O5 -PbO glass which reduces arcing in funnel portion of CRT
Assignee: Techneglas LLC
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Filing: 1979-10-17
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Granted: 1982-08-03
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Expires: 1999-10-17
Abstract
Abstract A glass composition is disclosed that is useful as a solder glass for sealing components together. However, the glass is also especially adapted for use as an electric resistance film for coating the inner neck or funnel portions of a cathode ray tube to reduce arcing. The glass composition includes primarily the oxides of vanadium and phosphorous with the preferred addition of either zinc oxide or lead oxide. Still other metal oxides may be optionally included such as oxides of barium, antimony, lithium, manganese, silicon, boron, molybdenum and mixtures thereof.
Inventors
- 👤 Edward A. Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:27
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C3/00; C03C3/12; C03C3/16; C03C3/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
In a cathode ray tube having a neck portion and a funnel portion, an electrically resistant film coating at least one of said portions within the tube adapted to reduce arcing, said film being a glass consisting essentially in weight percent of approximately: Vanadium Oxide 50% to 75%
Phosphorous Oxide
15% to 40%
Lead Oxide 5% to 20%
______________________________________ in which said glass composition has a softening point no higher than about 475° C., and an electrical resistance within the range of about 100,000 ohms to about 100 megohms per square.
Claim 2
Dependent Claim
91 words
In a cathode ray tube having a neck portion and a funnel portion, an electrically resistant film coating at least one of said portions within the tube adapted to reduce arcing, said film being a glass consisting essentially in weight percent of approximately: Vanadium Oxide 50% to 75%
Phosphorous Oxide
15% to 40%
Lead Oxide 5% to 20%
______________________________________ in which said glass composition has a softening point no higher than about 475° C., and an electrical resistance within the range of about 100,000 ohms to about 100 megohms per square.
Claim 3
Dependent Claim
40 words
The cathode ray tube of claim 1 in which said glass composition contains an additive oxide from 0% to about 15% by weight, said additive oxide being an oxide of barium, antimony, lithium, manganese, silicon, boron, molybdenum, and mixtures thereof.
Claim 4
Dependent Claim
15 words
The cathode ray tube of claim 1 in which said glass is substantially completely vitreous.
Claim 5
Dependent Claim
19 words
The cathode ray tube of claim 1 in which said glass has a flow ratio of at least 3.
Claim 6
Dependent Claim
26 words
The cathode ray tube of claim 1 in which at least one of said portions contains a graphitic film to which said glass film is applied.
Claim 7
Dependent Claim
14 words
The cathode ray tube of claim 1 in which said glass is substantially water-soluble.
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Cited
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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) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |