US4405881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color cathode ray tube including Nd2 O3 and Cr2 O3 in face glass
Assignee: Mitsubishi Electric Corp
•
Filing: 1981-05-20
•
Granted: 1983-09-20
•
Expires: 2001-05-20
Abstract
Abstract A color cathode ray tube comprises a fluorescent screen having one or more phosphors on an inner surface of a face glass for plural emission colors, and the face glass which contains a Nd 2 O 3 and other colorants to give a wavelength selectivity of light transmission of said face glass.
Inventors
- 👤 Hiroo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; C09K11/77742; H01J29/86; H01J29/863
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
In a color cathode ray tube comprising a fluorescent screen having at least one phosphor on an inner surface of the face glass for plural color emission, the improvement comprising: incorporating 0.3 to 1.5 wt% per 10 mm glass thickness, of Nd 2 O 3 and a small amount of the colorant Cr 2 O 3 and optionally other colorants in said face glass to impart wavelength selectivity to said face glass.
Claim 2
Dependent Claim
72 words
In a color cathode ray tube comprising a fluorescent screen having at least one phosphor on an inner surface of the face glass for plural color emission, the improvement comprising: incorporating 0.3 to 1.5 wt% per 10 mm glass thickness, of Nd 2 O 3 and a small amount of the colorant Cr 2 O 3 and optionally other colorants in said face glass to impart wavelength selectivity to said face glass.
Claim 3
Dependent Claim
27 words
The color cathode ray tube of claim 1, wherein said face glass further contains less than 0.5 wt% of Pr 2 O 3 as a second colorant.
Claim 4
Dependent Claim
17 words
The color cathode ray tube of claim 1 or 2, wherein said phosphor is a pigment phosphor.
Claim 5
Dependent Claim
38 words
The color cathode ray tube of claim 1 or 2, wherein said fluorescent screen is formed upon admixture of a plurality of phosphors thereby giving rise to plural color emission on the part of said cathode ray tube.
Claim 6
Dependent Claim
43 words
The color cathode ray tube of claim 1 or 2, wherein said green phosphor is Gd 2 O 2 S: Tb or Y 2 SiO 5 : Tb either of which gives a main linear emission wavelength at about 540 to 550 nm.
Claim 7
Dependent Claim
32 words
The cathode ray tube of claim 1 or 2, wherein the phosphors on the inner surface of said face glass which emit green and red light exhibit substantially linear spectral emission characteristics.
Claim 8
Dependent Claim
37 words
The cathode ray tube of claim 1, wherein said face glass containing neodymium oxide exhibits light absorption characteristics in the wavelength regions of about 470 to 480 nm, 510 to 530 nm and 570 to 585 nm.
References Cited (Backward Citations)
US3143683A
Cited
US3418246A
Cited
US3547675A
Cited
US4065696A
Cited
US3654505A
Cited
US3950668A
Cited
US3873868A
Cited
US3946267A
Cited
JPS5242361A
Cited
US4172920A
Cited
US4209567A
Cited
US4307320A
Cited
US4307320B1
Cited
US4177399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |