US4556820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image display including a light-absorbing matrix of zinc-iron sulfide
Assignee: RCA Licensing Corp
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Filing: 1983-12-27
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Granted: 1985-12-03
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Expires: 2003-12-27
Abstract
Abstract Image display including a viewing screen comprising spaced elemental image areas and a light-absorbing matrix of crystalline zinc-iron sulfide particles adjacent to these areas. The display may be made by producing a layer which is tacky in substantially the pattern of the desired matrix, and then contacting crystalline zinc-iron sulfide particles with the tacky pattern, whereby particles adhere to the tacky pattern, thereby producing the desired matrix.
Inventors
- 👤 Robert P. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:41
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32; H01J29/327; H01J29/28; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2278
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
29 words
An image display including a viewing screen comprising spaced elemental image areas and a light-absorbing matrix adjacent said spaced areas, said matrix consisting essentially of crystalline zinc-iron sulfide particles.
Claim 2
Dependent Claim
29 words
An image display including a viewing screen comprising spaced elemental image areas and a light-absorbing matrix adjacent said spaced areas, said matrix consisting essentially of crystalline zinc-iron sulfide particles.
Claim 3
Dependent Claim
22 words
The display defined in claim 1 wherein said zinc-iron sulfide particles have a molar composition: Zn.sub.1-x Fe.sub.x S wherein x=0.1 to 0.9.
Claim 4
Dependent Claim
17 words
The display defined in claim 2 wherein said particles have the approximate molar composition: Zn.sub.0.5 Fe.sub.0.5 S.
Claim 5
Dependent Claim
31 words
The display defined in claim 1 wherein a layer of said particles reflects about 4.4% of incident white light, and the reflected light has CIE coordinates of about x=0.458 and y=0.416.
Claim 6
Dependent Claim
37 words
The display defined in claim 1 wherein said viewing screen is attached to the inner surface of the viewing window of a multicolor cathode-ray tube, and each of said elemental image areas is filled with cathodoluminescent material.
Claim 7
Dependent Claim
29 words
The display defined in claim 5 wherein said tube is a color television picture tube and said elemental areas are ordered arrays of red-emitting, green-emitting and blue-emitting cathodoluminescent material.
Claim 8
Dependent Claim
24 words
The display defined in claim 6 wherein at least two of said cathodoluminescent materials have surface characteristics similar to those of pure zinc sulfide.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |