US4861737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic translucent material, method of manufacturing such a material and high-pressure discharge lamp provided with such a material
Assignee: US Philips Corp
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Filing: 1988-04-06
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Granted: 1989-08-29
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Expires: 2008-04-06
Abstract
Abstract Ceramic translucent material mainly comprising densely sintered polycrystalline yttrium aluminum garnet in which between 20 and 1500 ppm by weight of ZrO 2 is added to the yttrium aluminum garnet. When manufacturing an article of such a ceramic translucent material, a thermal treatment is carried out at a temperature of more than 1400° C. in an oxidizing atmosphere after sintering.
Inventors
- 👤 Peter R. Prud'homme van Reine
- 👤 Leonardus J. van Ijzendoorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/302; C; C04; C04B; C04B35/00; C04B35/01; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A densely sintered translucent ceramic material consisting essentially of polycrystalline yttrium aluminum garnet and between 20 and 1500 ppm by weight of ZrO 2 .
Claim 2
Dependent Claim
25 words
A densely sintered translucent ceramic material consisting essentially of polycrystalline yttrium aluminum garnet and between 20 and 1500 ppm by weight of ZrO 2 .
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |