US3879627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display tube with neutral density filtration
Assignee: Raytheon Co
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Filing: 1974-03-25
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Granted: 1975-04-22
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Expires: 1994-03-25
Abstract
Abstract A cathode ray display tube having improved viewability under conditions of high ambient illumination levels, this being achieved by providing a tube faceplate and an implosion panel thereover, with a transparent adhesive material between the faceplate and panel having intermixed therein a selected material which provides the adhesive material with selected neutral density filtration characteristics for enhancing contrast in the viewed display.
Inventors
- 👤 Ronald C Robinder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:52
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/87; H01J29/89; H01J29/896; H01J2229/00; H01J2229/87; H01J2229/875
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
A display tube comprising an evacuated envelope having a clear transparent faceplate in a wall thereof, a layer of phosphor material adjacent the inner side of said faceplate for generating light in the visible spectrum, a clear transparent protective panel adjacent the outer side of said faceplate, and a bonding material between said faceplate and panel, said bonding material having selected neutral density filtration characteristics in the visible spectrum.
Claim 2
Dependent Claim
69 words
A display tube comprising an evacuated envelope having a clear transparent faceplate in a wall thereof, a layer of phosphor material adjacent the inner side of said faceplate for generating light in the visible spectrum, a clear transparent protective panel adjacent the outer side of said faceplate, and a bonding material between said faceplate and panel, said bonding material having selected neutral density filtration characteristics in the visible spectrum.
Claim 3
Dependent Claim
69 words
A display tube comprising an evacuated envelope having a clear transparent faceplate in a wall thereof, a layer of phosphor material adjacent the inner side of said faceplate for generating light in the visible spectrum, a clear transparent protective panel adjacent the outer side of said faceplate, and a bonding material between said faceplate and panel, said bonding material having selected neutral density filtration characteristics in the visible spectrum.
Claim 4
Dependent Claim
69 words
A display tube comprising an evacuated envelope having a clear transparent faceplate in a wall thereof, a layer of phosphor material adjacent the inner side of said faceplate for generating light in the visible spectrum, a clear transparent protective panel adjacent the outer side of said faceplate, and a bonding material between said faceplate and panel, said bonding material having selected neutral density filtration characteristics in the visible spectrum.
Claim 5
Dependent Claim
49 words
A display tube as set forth in claim 1 wherein said bonding material comprises a normally clear transparent aDhesive matrix having mixed therewith selected amounts of particulate material which provides desired filtration density without substantially affecting color of the light emitted by said light-generating layer in the visible spectrum.
Claim 6
Dependent Claim
24 words
A display tube as set forth in claim 2 wherein said matrix comprises a resin, and said particulate material comprises a colloidal carbon suspension.
Claim 7
Dependent Claim
60 words
A display tube as set forth in claim 2 wherein said bonding material is a stock solution of resin containing about 1 percent of colloidal graphite mixed with base resin in amounts of from about 1 part stock solution with from 1 to 9 or more parts of base resin, depending upon the density desired of the resultant bonding material.
Claim 8
Dependent Claim
28 words
A display tube as set forth in claim 1 wherein said bonding material has been about 20-22 percent transmission of all wavelengths of light between about 400-700 nanometers.
Claim 9
Dependent Claim
97 words
A display tube comprising an evacuated envelope having a clear transparent faceplate at one end thereof, a layer of phosphor on the inner surface of said faceplate for generating light in the visible spectrum, electron beam-producing means in the opposite end of the envelope, said phosphor being responsive upon impingement by electrons from said means to generate said light in the visible spectrum, a clear transparent protective panel adjacent the outer side of said faceplate, and a bonding material between said faceplate and panel, said bonding material having selected neutral density filtration characteristics in the visible spectrum.
Claim 10
Dependent Claim
97 words
A display tube comprising an evacuated envelope having a clear transparent faceplate at one end thereof, a layer of phosphor on the inner surface of said faceplate for generating light in the visible spectrum, electron beam-producing means in the opposite end of the envelope, said phosphor being responsive upon impingement by electrons from said means to generate said light in the visible spectrum, a clear transparent protective panel adjacent the outer side of said faceplate, and a bonding material between said faceplate and panel, said bonding material having selected neutral density filtration characteristics in the visible spectrum.
Claim 11
Dependent Claim
49 words
A display tube as set forth in claim 6 wherein said bonding material comprises a normally clear transparent adhesive matrix having mixed therewith selected amounts of particulate material which provides desired filtration density without substantially affecting color of the light emitted by said light-generating layer in the visible spectrum.
Claim 12
Dependent Claim
24 words
A display tube as set forth in claim 7 wherein said matrix comprises a resin, and said particulate material comprises a colloidal carbon suspension.
Claim 13
Dependent Claim
59 words
A display tube as set forth in claim 7 wherein said bonding material is a stock solution of resin containing about 1 percent of colloidal graphite mixed with base resin in amounts of from about 1 part stock solution with from 1 to 9 or more parts of base resin, depending upon the density desired of the resultant bonding.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |