Patent US5122708A successfully refreshed from Google Patents.
US5122708A
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Color reference CRT and method of making
Assignee: Philips North America LLC
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Filing: 1990-12-12
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Granted: 1992-06-16
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Expires: 2010-12-12
Abstract
Abstract A color reference CRT of the type employing a screen of a pattern of individual phosphor elements of different color components, is produced by adjusting the screen weights of the different color components to achieve the desired reference color when the screen is scanned by an electron beam of predetermined beam current and anode potential.
Inventors
- 👤 Robert L. Donofrio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:38
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32; H01J29/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
Color reference CRT comprising a screen of a pattern of individual phosphor elements of different component color fields, and at least one electron gun for generating at least one electron beam, characterized in that the relative screen weights of the different color components are predetermined to result in a single, invariant standard color when the screen is scanned by an electron beam of predetermined beam current and anode voltage, the color being the integrated output of the separate outputs of the component colors.
Claim 2
Dependent Claim
83 words
Color reference CRT comprising a screen of a pattern of individual phosphor elements of different component color fields, and at least one electron gun for generating at least one electron beam, characterized in that the relative screen weights of the different color components are predetermined to result in a single, invariant standard color when the screen is scanned by an electron beam of predetermined beam current and anode voltage, the color being the integrated output of the separate outputs of the component colors.
Claim 3
Dependent Claim
23 words
The CRT of claim 1 in which the sizes of the individual phosphor elements of the component color fields are substantially the same.
Claim 4
Dependent Claim
35 words
The CRT of claim 1 in which the sizes of the individual phosphor elements of the component color fields all vary by substantially the same amount from the center to the edges of the screen.
Claim 5
Dependent Claim
15 words
The CRT of claim 1 in which the screen comprises three interlaced component color fields.
Claim 6
Dependent Claim
18 words
The CRT of claim 4 in which the three component color fields are red, blue and green-emitting, respectively.
Claim 7
Dependent Claim
25 words
The CRT of claim 5 in which the phosphor elements are stripe-shaped, and the pattern comprises repeating triplets of red, green and blue-emitting phosphor elements.
References Cited (Backward Citations)
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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) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |