US4863882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rare earth oxysulfide ceramics
Assignee: Toshiba Corp
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Filing: 1988-03-15
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Granted: 1989-09-05
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Expires: 2008-03-15
Abstract
Abstract Rare earth oxysulfide ceramic material prepared by covering the material with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealing it into an airtight vessel of tantalum or niobium, and then subjecting it to a hot isostatic press process.
Inventors
- 👤 Naotoshi Matsuda
- 👤 Masaaki Tamatani
- 👤 Kazuto Yokota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F3/1241; C04B35/515; C04B35/547
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
Rare earth oxysulfide ceramics of reduced coloration and improved emission efficiency manufactured by covering at least one rare earth oxysulfide ceramic material preptreated by a cold press with a foil of a metal selected form the group consisting of molybdenum, tungsten, platinum, and rhenium, sealing the metal foil-covered material into an aritight vessel of tantalum or niobium and, then, subjecting the sealed material to a hot isostatic press process.
Claim 2
Dependent Claim
69 words
Rare earth oxysulfide ceramics of reduced coloration and improved emission efficiency manufactured by covering at least one rare earth oxysulfide ceramic material preptreated by a cold press with a foil of a metal selected form the group consisting of molybdenum, tungsten, platinum, and rhenium, sealing the metal foil-covered material into an aritight vessel of tantalum or niobium and, then, subjecting the sealed material to a hot isostatic press process.
Claim 3
Dependent Claim
37 words
A rare earth oxysulfide ceramic according to claim 1, wherein the bulk density is more than 99.9%, and the diffuse transmittance is more than 20.5% when the thickness of the rare earth oxysulfide ceramic is 2 mm.
Claim 4
Dependent Claim
18 words
A ceramic according to claim 1, wherein said ceramic is a fluorescent material of a rare earth oxysulfide.
References Cited (Backward Citations)
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Cited
US4242221A
Cited
US4443380A
Cited
JPS58204088A
Cited
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Cited
US4733088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |