Patent US3748515A successfully refreshed from Google Patents.
US3748515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television picture tube with subtractive color filters
Assignee: Zenith Electronics LLC
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Filing: 1972-04-03
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Granted: 1973-07-24
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Expires: 1992-04-03
Abstract
Abstract The screen of a three gun shadow mask type of color picture tube is formed of three filters each predominantly transmissive of magenta, yellow and cyan which are the respective complements of the primary colors green, blue and red. Each filter covers the faceplate except in image areas assigned to its complementary primary phosphor. Each image area thus includes two overlying filters cooperating to allow transmission of light associated with its assigned primary color. The spaces between image areas are covered by all three complementary filters and are substantially opaque to visible light.
Inventors
- 👤 S Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:42
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/898; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J31/201; H01J31/203; H01J31/206
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A screen in accordance with claim 1 wherein the image elements in each set include a phosphor component for emitting light of one of said primary colors and a filter component formed by different overlying filters each exhibiting light transmission characteristics complementary to a different one of the remainder of said primary colors.
Claim 2
Dependent Claim
47 words
A screen in accordance with claim 2 wherein said filter component is deposited on said faceplate and said phosphor component is deposited over its associated filter component; said filter component extending over portions of said faceplate surrounding its image element and constituting a portion of said attenuator.
Claim 3
Dependent Claim
72 words
A screen in accordance with claim 3 wherein said primary colors are red, blue and green and said filters are cyan, yellow and magenta, the image elements associated with said red, blue and green primaries consisting respectively of red light emitting phosphor and overlying filters of yellow and magenta, blue light emitting phosphor and overlying filters of magenta and cyan and green light emitting phosphor and overlying filters of yellow and cyan.
Claim 4
Dependent Claim
163 words
A screen for a color television picture tube that includes a shadow mask having a pattern of apertures mounted adjacent a faceplate which is transmissive of substantially all wavelengths of light in the visible spectrum comprising: a plurality of sets of image elements disposed in similar patterns and interleaved with one another over said faceplate, the imagE elements being smaller in area than the projected areas of their corresponding apertures in the shadow mask and including a phosphor component for emitting light of one of a plurality of primary colors and a filter component consisting of overlying filters having transmission characteristics complementary to a different one of each of the remaining primary colors; and a visible light attenuator disposed on the faceplate in the portions intervening the image elements, said attenuator comprising extensions of the filters which project into the immediately contiguous part of the intervening portions in overlapping relationship with similar extensions of filters associated with adjacent ones of the image elements.
Claim 5
Dependent Claim
72 words
A screen in accordance with claim 5 wherein said primary colors are red, blue and green and wherein said filter components comprise, respectively, yellow and magenta filters for the image elements associated with said red primary, magenta and cyan filters for the image elements associated with said blue primary, and yellow and cyan filters for the image elements associated with said green primary; and wherein said intervening portions include all three filters.
Claim 6
Dependent Claim
36 words
A screen in accordance with claim 6 wherein said apertures are substantially circular and wherein said filter components are substantially hexagonal with their maximum dimension being less than the diameter of their respective projected aperture area.
References Cited (Backward Citations)
US3344301A
Cited
US3569761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |