US4752424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a rare earth oxysulfide ceramic
Assignee: Toshiba Corp
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Filing: 1987-01-20
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Granted: 1988-06-21
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Expires: 2007-01-20
Abstract
Abstract There is provided a method of manufacturing a ceramic, wherein a ceramic material is covered with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealed into an airtight vessel of tantalum or niobium, and then subjected to a hot isostatic press process. The method of the present invention can suppress coloration produced in the hot isostatic press.
Inventors
- 👤 Naotoshi Matsuda
- 👤 Masaaki Tamatani
- 👤 Kazuto Yokota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:47
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: 6
Claim 1
Independent Claim
59 words
A method of manufacturing rare earth oxysulfide ceramics, wherein at least one rare earth oxysulfide ceramic material pretreated by a cold press is covered with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealed into an airtight vessel of tantalum or niobium, and then subjected to a hot isostatic press process.
Claim 2
Independent Claim
59 words
A method of manufacturing rare earth oxysulfide ceramics, wherein at least one rare earth oxysulfide ceramic material pretreated by a cold press is covered with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealed into an airtight vessel of tantalum or niobium, and then subjected to a hot isostatic press process.
Claim 3
Dependent Claim
29 words
A method according to claim 1, wherein said rare earth oxysulfide is a gadolinium oxysulfide or a gadolinium oxysulfide obtained by partially substituting gadolinium with another rare earth element.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein said foil is made of molybdenum, and said airtight vessel is formed of tantalum.
Claim 5
Dependent Claim
28 words
A method according to claim 1, wherein the rare earth oxysulfide is subjected to a heat treatment in an ambient atmosphere prior to said hot isostatic press process.
Claim 6
Dependent Claim
22 words
A method according to claim 1, wherein said hot isostatic press process is performed at a temperature of 1,300° to 1,800° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |