US5032316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent composition
Assignee: Mitsubishi Chemical Corp
•
Filing: 1988-10-18
•
Granted: 1991-07-16
•
Expires: 2008-10-18
Abstract
Abstract A fluorescent composition composed of a mixture of a sulfide phosphor and a conductive material, the sulfide phosphor consisting essentially of a sulfide of the formula (Zn1-x, Cdx)S wherein x is a number satisfying a condition of 0</=x</=1, as host material, and zinc oxide (ZnO) or a compound capable of being converted to zinc oxide (ZnO) by heat treatment and alumina, adhered to the surface of the host material.
Inventors
- 👤 Fumio Takahashi
- 👤 Kunihiko Yoneshima
- 👤 Takashi Hase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:45
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/56; C09K11/562; C09K11/565; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A fluorescent composition composed of a mixture of a sulfide phosphor and a conductive material, said sulfide phosphor consisting of a sulfide of the formula (Zn 1-x , Cd x )S wherein x is a number satisfying a condition of 0≦x≦1, as host material, and a material consisting of zinc oxide (ZnO) or a compound capable of being converted to zinc oxide (ZnO) by heat treatment and alumina, adhered to the surface of said sulfide phosphor.
Claim 2
Dependent Claim
76 words
A fluorescent composition composed of a mixture of a sulfide phosphor and a conductive material, said sulfide phosphor consisting of a sulfide of the formula (Zn 1-x , Cd x )S wherein x is a number satisfying a condition of 0≦x≦1, as host material, and a material consisting of zinc oxide (ZnO) or a compound capable of being converted to zinc oxide (ZnO) by heat treatment and alumina, adhered to the surface of said sulfide phosphor.
Claim 3
Dependent Claim
28 words
The fluorescent composition according to claim 1, wherein the amount of the adhered alumina is more than 0 and not more than 850 ppm as calculated as aluminum.
Claim 4
Dependent Claim
47 words
The fluorescent composition according to claim 1, wherein the amount of the adhered zinc oxide or compound capable of being converted to zinc oxide by heat treatment is within a range of from 0.005 to 1.0% by weight as calculated as zinc based on said sulfide phosphor.
Claim 5
Dependent Claim
42 words
The fluorescent composition according to claim 2, wherein the amount of the adhered zinc oxide or compound capable of being converted to zinc oxide by heat treatment is within a range of from 0.005 to 1.0% by weight as calculated as zinc.
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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |