US4423349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Green fluorescence-emitting material and a fluorescent lamp provided therewith
Assignee: Nichia Denshi Kagaku Co Ltd
•
Filing: 1981-07-01
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Granted: 1983-12-27
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Expires: 2001-07-01
Abstract
Abstract A green light-emitting fluorescent material prepared from terbium-activated lanthanum cerium orthophosphate expressed by the structural formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9 and a fluorescent lamp comprising said green light-emitting fluorescent material used alone or in combination with any other form of fluorescent material.
Inventors
- 👤 Shigeharu Nakajima
- 👤 Keiji Ichinomiya
- 👤 Koichi Okada
- 👤 Kaname Tsuchikura
- 👤 Minoru Kashiwagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:55
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7777
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
27 words
A green light-emitting fluorescent material prepared from terbium activated lanthanum cerium orthophosphate and expressed by formula (I): La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 2
Dependent Claim
27 words
A green light-emitting fluorescent material prepared from terbium activated lanthanum cerium orthophosphate and expressed by formula (I): La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 3
Dependent Claim
36 words
The green light-emitting fluorescent material according to claim 1, wherein the term z given in formula (I) is 0.62 to 0.80; the term y is 0.08 to 0.20; and the term x is 0.12 to 0.30.
Claim 4
Dependent Claim
21 words
The green light-emitting fluorescent material according to claim 1 or 2, which comprises at least one of yttrium, gadolinium and lutecium.
Claim 5
Dependent Claim
79 words
A 3-wavelength type fluorescent lamp which is provided with 16 to 28% of a blue light-emitting fluorescent material 35 to 49% of a green light-emitting fluorescent material 26 to 38% of a red light-emitting fluorescent material wherein said fluorescent lamp is chosen to have a color temperature around 5000° K., and in which the green light-emitting fluorescent material is prepared from terbium-activated lanthanum cerium orthophosphate expressed by the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 6
Dependent Claim
79 words
A 3-wavelength type fluorescent lamp which is provided with 16 to 28% of a blue light-emitting fluorescent material 35 to 49% of a green light-emitting fluorescent material 26 to 38% of a red light-emitting fluorescent material wherein said fluorescent lamp is chosen to have a color temperature around 5000° K., and in which the green light-emitting fluorescent material is prepared from terbium-activated lanthanum cerium orthophosphate expressed by the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 7
Dependent Claim
34 words
The fluorescent lamp according to claim 4, wherein the term z given in formula (I) is 0.62 to 0.80; the term y is 0.08 to 0.20; and the term x is 0.12 to 0.30.
Claim 8
Dependent Claim
24 words
The fluorescent lamp according to claim 4 or 5, wherein the green light-emitting fluorescent material contains at least one of yttrium, gadolinium and lutecium.
Claim 9
Dependent Claim
43 words
The fluorescent lamp according to claim 4 or 5, which is further provided with less than 70 parts by weight of the calcium halophosphate fluorescent material based on the total 100 parts by weight of the blue, green and red lights-emitting fluorescent materials.
Claim 10
Dependent Claim
39 words
A fluorescent lamp used with an electronic copying machine, whose inside is coated with a green light-emitting fluorescent material prepared from terbium-activated lanthanum cerium orthophosphate expressed by the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 11
Dependent Claim
39 words
A fluorescent lamp used with an electronic copying machine, whose inside is coated with a green light-emitting fluorescent material prepared from terbium-activated lanthanum cerium orthophosphate expressed by the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 12
Dependent Claim
33 words
A green light-emitting fluorescent material of the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where x+y+z=1 and where z is 0.62 to 0.80, y is 0.08 to 0.20, and x is 0.12 to 0.30.
Claim 13
Dependent Claim
33 words
A green light-emitting fluorescent material of the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where x+y+z=1 and where z is 0.62 to 0.80, y is 0.08 to 0.20, and x is 0.12 to 0.30.
Claim 14
Dependent Claim
22 words
The fluorescent lamp according to claim 8 or 9, which is further provided with at least one of yttrium, gadolinium and lutecium.
Claim 15
Dependent Claim
60 words
A mercury vapor discharge lamp, which comprises a single or a plurality of bright membranes prepared from a plurality of fluorescent materials, whose color temperature ranges from 2800° to 7000° K., and wherein a green light-emitting fluorescent material is prepared from terbium activated lanthanum cerium orthophosphate expressed by the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
Claim 16
Dependent Claim
60 words
A mercury vapor discharge lamp, which comprises a single or a plurality of bright membranes prepared from a plurality of fluorescent materials, whose color temperature ranges from 2800° to 7000° K., and wherein a green light-emitting fluorescent material is prepared from terbium activated lanthanum cerium orthophosphate expressed by the formula: La.sub.x Tb.sub.y Ce.sub.z PO.sub.4 (I) where: x+y+z=1 0.05<x<0.35 0.05<y<0.3 0.6<z<0.9.
References Cited (Backward Citations)
US4208611A
Cited
US4215289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |