US3873868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display tube with color selective filtration
Assignee: Raytheon Co
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Filing: 1974-03-25
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Granted: 1975-03-25
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Expires: 1994-03-25
Abstract
Abstract A cathode ray display tube having color selective filtration for providing improvement in viewability of a display by providing higher brightness for a given contrast ratio, this being achieved by providing within the resin material which bonds the implosion panel to the faceplate a filter in the form of a thin film having color characteristics matched to the color of the emission from the phosphor screen of the tube.
Inventors
- 👤 Ronald C Robinder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:10
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/898; H01J29/02; H01J29/10; H01J29/18; H01J29/28; H01J29/87; H01J2229/00; H01J2229/87; H01J2229/875
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A display tube comprising an evacuated envelope having a transparent faceplate in one wall thereof, a light-generating layer disposed adjacent the inner side of said faceplate, and adapted to emit light of a predetermined color, a transparent protective panel adjacent the outer side of the faceplate and spaced therefrom, a layer of transparent bonding material in said space between the faceplate and panel, and a light-filtering film disposed within said bonding material and having a selected color which approximates the color of the light emitted by said lightgenerating layer.
Claim 2
Dependent Claim
89 words
A display tube comprising an evacuated envelope having a transparent faceplate in one wall thereof, a light-generating layer disposed adjacent the inner side of said faceplate, and adapted to emit light of a predetermined color, a transparent protective panel adjacent the outer side of the faceplate and spaced therefrom, a layer of transparent bonding material in said space between the faceplate and panel, and a light-filtering film disposed within said bonding material and having a selected color which approximates the color of the light emitted by said lightgenerating layer.
Claim 3
Dependent Claim
22 words
A display tube as set forth in claim 1 wherein said bonding material is a resin, and said film is a plastic.
Claim 4
Dependent Claim
32 words
A display tube as set forth in claim 1 wherein said light-generating layer emits light predominately between about 600-700 nanometers in wavelength and said film absorbs light of substantially all other wavelengths.
Claim 5
Dependent Claim
32 words
A display tube as set forth in claim 1 wherein said light-generating layer emits light predominately between about 475-575 nanometers in wavelength, and said film absorbs light of substantially all other wavelengths.
Claim 6
Dependent Claim
109 words
A display tube comprising an evacuated envelope having a transparent faceplate at one end thereof, a layer of light-generating phosphor on the inner surface of said faceplate, electron beam-producing means in the opposite end of the envelope, said phosphor being responsive to impingement by electrons from said means to generate light of a predetermined color, a transparent protective panel adjacent the outer side of the faceplate and spaced therefrom, a layer of transparent bonding material in said space between the faceplate and panel, and a light-filtering film disposed within said bonding material and having a selected color which approximates the color of the light emitted by said light-generating layer.
Claim 7
Dependent Claim
109 words
A display tube comprising an evacuated envelope having a transparent faceplate at one end thereof, a layer of light-generating phosphor on the inner surface of said faceplate, electron beam-producing means in the opposite end of the envelope, said phosphor being responsive to impingement by electrons from said means to generate light of a predetermined color, a transparent protective panel adjacent the outer side of the faceplate and spaced therefrom, a layer of transparent bonding material in said space between the faceplate and panel, and a light-filtering film disposed within said bonding material and having a selected color which approximates the color of the light emitted by said light-generating layer.
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |