Patent US4135113A successfully refreshed from Google Patents.
US4135113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line-type picture tube with light-absorbing particles mixed with blue phosphor
Assignee: Toshiba Corp
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Filing: 1977-03-07
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Granted: 1979-01-16
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Expires: 1997-03-07
Abstract
Abstract A color picture tube in which at least one of phosphor layers emitting green, blue and red lights which are deposited on the inner surface of a glass panel contains a black light-absorbing material.
Inventors
- 👤 Asahide Tsuneta
- 👤 Yasuo Ohta
- 👤 Makoto Ikegaki
- 👤 Takeo Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:47
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; H01J9/2278
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A color picture tube which comprises a glass panel; a plurality of groups consisting of green, blue and red phosphor strips on the inner surface of said glass panel; black nonluminescent strips laid between said phosphor strips and the inner surface of said glass panel; and wherein said blue phosphor strip contains 0.1% to 3.0% by weight of black light-absorbing particles based on the weight of said phosphor dispersed throughout the strip for reducing reflection.
Claim 2
Dependent Claim
75 words
A color picture tube which comprises a glass panel; a plurality of groups consisting of green, blue and red phosphor strips on the inner surface of said glass panel; black nonluminescent strips laid between said phosphor strips and the inner surface of said glass panel; and wherein said blue phosphor strip contains 0.1% to 3.0% by weight of black light-absorbing particles based on the weight of said phosphor dispersed throughout the strip for reducing reflection.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |