US4283655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with multiple internal graticules
Assignee: Tektronix Inc
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Filing: 1979-10-26
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Granted: 1981-08-11
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Expires: 1999-10-26
Abstract
Abstract A cathode-ray tube for a multipurpose test and measurement or information display instrument is provided with multiple internal graticules. One of the graticules is permanently visible and functional at all times the instrument is in operation. Another of the graticules is formed in a manner such that it is not easily visible in normal ambient lighting conditions alone, but becomes plainly visible when edge lighted by suitable means.
Inventors
- 👤 Ralph A. Mossman
- 👤 Kenneth R. Stinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J2229/00; H01J2229/89; H01J2229/8926
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
In a cathode-ray tube having a transparent faceplate carrying a phosphor layer on its inner surface, means defining a first graticule scale formed beneath said phosphor layer and adjoining said inner surface, means defining a second graticule scale formed beneath said phosphor layer and adjoining said inner surface, and user controllable edge lighting means for directing light into said faceplate to illuminate said scales, one of said first and second scales being formed in a manner such that it is readily visible in the absence of illumination by said edge lighting means, the other of said scales being formed in a manner such that it is readily visable only when illuminated by said edge lighting means.
Claim 2
Dependent Claim
116 words
In a cathode-ray tube having a transparent faceplate carrying a phosphor layer on its inner surface, means defining a first graticule scale formed beneath said phosphor layer and adjoining said inner surface, means defining a second graticule scale formed beneath said phosphor layer and adjoining said inner surface, and user controllable edge lighting means for directing light into said faceplate to illuminate said scales, one of said first and second scales being formed in a manner such that it is readily visible in the absence of illumination by said edge lighting means, the other of said scales being formed in a manner such that it is readily visable only when illuminated by said edge lighting means.
Claim 3
Dependent Claim
48 words
The cathode-ray tube of claim 1, wherein said one scale is formed of a material having a color that visually contrasts with the color of said phosphor layer, and the other scale is formed of a material having a color that substantially matches the color of said layer.
Claim 4
Dependent Claim
21 words
The cathode-ray tube of claim 2, wherein said graticule scales comprise patterns of glass frit material fused to said faceplate surface.
Claim 5
Dependent Claim
35 words
The cathode-ray tube of claim 1, wherein said first scale comprises a pattern of glass frit material fused to said faceplate surface, and said second scale comprises a pattern of grooves formed in said surface.
Claim 6
Dependent Claim
27 words
The cathode-ray tube of claim 4, wherein said first scale is of a frit material containing a colorant that contrasts with the color of said phosphor layer.
Claim 7
Dependent Claim
152 words
A cathode-ray tube for use in a multipurpose electronic instrument, said tube having a transparent faceplate carrying a phosphor layer on its inner surface, a first pattern of glass frit fused to said faceplate surface to define a first graticule scale beneath said phosphor layer, a second pattern of glass frit fused to said faceplate surface to define a second graticule scale beneath said phosphor layer, user controllable edge lighting means for directing light into said faceplate to illuminate said scales, the glass frit of said first pattern including a colorant different from the color of said phosphor layer, the glass frit of said second pattern including a colorant that substantially matches the color of said phosphor layer, whereby said first graticule scale is readily visible in the absence of illumination by said edge lighting means, and said second graticule scale is readily visible only when illuminated by said edge lighting means.
Claim 8
Dependent Claim
152 words
A cathode-ray tube for use in a multipurpose electronic instrument, said tube having a transparent faceplate carrying a phosphor layer on its inner surface, a first pattern of glass frit fused to said faceplate surface to define a first graticule scale beneath said phosphor layer, a second pattern of glass frit fused to said faceplate surface to define a second graticule scale beneath said phosphor layer, user controllable edge lighting means for directing light into said faceplate to illuminate said scales, the glass frit of said first pattern including a colorant different from the color of said phosphor layer, the glass frit of said second pattern including a colorant that substantially matches the color of said phosphor layer, whereby said first graticule scale is readily visible in the absence of illumination by said edge lighting means, and said second graticule scale is readily visible only when illuminated by said edge lighting means.
Claim 9
Dependent Claim
140 words
A cathode-ray tube for use in a multipurpose electronic instrument, said tube having a transparent faceplate carrying a phosphor layer on its inner surface, a pattern of glass frit fused to said faceplate surface and defining a first graticule scale beneath said phosphor layer, a pattern of grooves formed in said inner surface of the faceplate and defining a second graticule scale, and user controllable edge lighting means for directing light into said faceplate to illuminate said scales, said glass frit including a colorant that visually contrasts with the color of said phosphor layer, said grooves being filled with the phosphor material forming said phosphor layer, whereby said first graticule scale is readily visible in the absence of illumination by said edge lighting means, and said second graticule scale is readily visible only when illuminated by said edge lighting means.
Claim 10
Dependent Claim
140 words
A cathode-ray tube for use in a multipurpose electronic instrument, said tube having a transparent faceplate carrying a phosphor layer on its inner surface, a pattern of glass frit fused to said faceplate surface and defining a first graticule scale beneath said phosphor layer, a pattern of grooves formed in said inner surface of the faceplate and defining a second graticule scale, and user controllable edge lighting means for directing light into said faceplate to illuminate said scales, said glass frit including a colorant that visually contrasts with the color of said phosphor layer, said grooves being filled with the phosphor material forming said phosphor layer, whereby said first graticule scale is readily visible in the absence of illumination by said edge lighting means, and said second graticule scale is readily visible only when illuminated by said edge lighting means.
References Cited (Backward Citations)
US3274421A
Cited
US3683225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |