US4374344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color picture tube with electrically conductive frit film on envelope surface
Assignee: Hitachi Ltd
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Filing: 1980-08-18
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Granted: 1983-02-15
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Expires: 2000-08-18
Abstract
Abstract A conductive spacer having one end secured to an electron gun structure housed in the neck tube of a color picture tube makes contact, at the other end, to a conductive film coated on the inner wall surface of the envelope of the color picture tube. A portion of the conductive film making contact with the conductive spacer comprises a conductive frit glass film.
Inventors
- 👤 Masayoshi Misono
- 👤 Shigeki Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:58
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/88; H01J2229/00; H01J2229/88; H01J2229/882
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
In a color picture tube comprising a vacuum envelope constituted by a panel portion, a funnel portion and a neck tube, an electron gun structure housed in the neck tube, an electrically conductive film coated on the inner wall surface of the envelope and extending from the funnel portion to the neck tube, and an electrically conductive spacer having one end secured to the electron gun structure and the other end in contact with the conductive film, the improvement wherein a portion of the conductive film which makes contact with the conductive spacer comprises an electrically conductive frit film made of a mixture of an electrically conductive material and frit glass.
Claim 2
Dependent Claim
111 words
In a color picture tube comprising a vacuum envelope constituted by a panel portion, a funnel portion and a neck tube, an electron gun structure housed in the neck tube, an electrically conductive film coated on the inner wall surface of the envelope and extending from the funnel portion to the neck tube, and an electrically conductive spacer having one end secured to the electron gun structure and the other end in contact with the conductive film, the improvement wherein a portion of the conductive film which makes contact with the conductive spacer comprises an electrically conductive frit film made of a mixture of an electrically conductive material and frit glass.
Claim 3
Dependent Claim
30 words
A color picture tube according to claim 1 wherein the portion of the conductive film is of a double layer structure of the conductive film and the conductive frit film.
Claim 4
Dependent Claim
51 words
A color picture tube according to claim 1 wherein the portion of the conductive film comprises a single layer structure of the conductive frit film directly coated on the inner wall surface of the envelope, and one end portion of the single layer structure overlapping the end of the conductive film.
Claim 5
Dependent Claim
25 words
A color picture tube according to claim 1 wherein the portion of the conductive film overlies on the inner wall surface of the neck tube.
Claim 6
Dependent Claim
33 words
A color picture tube according to claim 1 wherein the portion of the conductive film further comprises a water soluble substance used for a binder of the frit glass and the conductive material.
Claim 7
Dependent Claim
14 words
A color picture tube according to claim 1 wherein the conductive material is silver.
Claim 8
Dependent Claim
15 words
A color picture tube according to claim 1 wherein the conductive material mainly contains silver.
Claim 9
Dependent Claim
33 words
A color picture tube according to claim 1 wherein the ratio of the conductive material to be mixed with the frit glass is set within the range of 5 to 95% by weight.
Claim 10
Dependent Claim
28 words
A color picture tube according to claim 1 wherein the thickness of the conductive frit film after sintering is set within the range of 0.05 to 500 μm.
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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |