US4157215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photodeposition of CRT screen structures using cermet IC filter
Assignee: RCA Licensing Corp
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Filing: 1978-04-24
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Granted: 1979-06-05
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Expires: 1998-04-24
Abstract
Abstract Method of making a CRT screen structure includes projecting a light field through an IC filter having a tailored light transmission, through a photographic master, and incident upon a photosensitive layer. The IC filter, which adjusts the light intensity across the field, comprises a cermet layer constituted of inorganic light-absorbing metal particles in an inorganic light-transmitting medium; for example, a nickel-silica cermet.
Inventors
- 👤 Joseph J. Hanak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:17
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2272
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
In a photographic method for printing a screen structure for a cathode-ray tube including projecting a light field (a) through a light-transmission filter comprising inorganic light-absorbing particles, said filter having tailored variations in light transmission for producing predetermined variations in light intensity in said light field, (b) through a photographic master, and (c) incident upon a photosensitive layer, the improvement wherein said filter comprises a cermet layer constituted of inorganic light-absorbing metal particles nonuniformly distributed in an inorganic light-transmitting medium in predetermined manner to provide said tailored variations in light transmission.
Claim 2
Dependent Claim
91 words
In a photographic method for printing a screen structure for a cathode-ray tube including projecting a light field (a) through a light-transmission filter comprising inorganic light-absorbing particles, said filter having tailored variations in light transmission for producing predetermined variations in light intensity in said light field, (b) through a photographic master, and (c) incident upon a photosensitive layer, the improvement wherein said filter comprises a cermet layer constituted of inorganic light-absorbing metal particles nonuniformly distributed in an inorganic light-transmitting medium in predetermined manner to provide said tailored variations in light transmission.
Claim 3
Dependent Claim
23 words
The method defined in claim 1 wherein the average dimension of said particles is in the range of about 10 to 40 A.
Claim 4
Dependent Claim
14 words
The method defined in claim 1 wherein said particles are of a nickel metal.
Claim 5
Dependent Claim
39 words
The method defined in claim 1 wherein said particles are of a metal selected from the group consisting of Ti, Zr, Hf, V, Nb, Ag, Ta, Cr, Mo, W, Co, Ni, Ru, Rh, Pd, Re, Os, Ir and Pt.
Claim 6
Dependent Claim
43 words
The method defined in claim 1 wherein said medium is a dielectric selected from the group consisting of SiO 2 , Al 2 O 3 , MgO, Y 2 O 3 , TiO 2 , glass, ZnS, MgF 2 and CaF 2 .
Claim 7
Dependent Claim
21 words
The method defined in claim 1 wherein said particles are of nickel metal and said medium is of SiO 2 .
Claim 8
Dependent Claim
19 words
The method defined in claim 1 wherein said cermet layer has a thickness between about 400 and 2100 A.
Claim 9
Dependent Claim
27 words
The method defined in claim 1 wherein said cermet layer consists essentially of 4 to 50 volume percent metal particles and the balance of said inorganic medium.
Claim 10
Dependent Claim
27 words
The method defined in claim 1 wherein said cermet layer consists essentially of nickel-silica cermet containing between 4 and 20 volume percent nickel and the balance silica.
Claim 11
Dependent Claim
19 words
The method defined in claim 1 wherein said filter comprises a reflection-reducing coating in combination with said cermet layer.
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) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |