US4115134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent yttria ceramics and method for producing same
Assignee: Osram Sylvania Inc
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Filing: 1977-07-11
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Granted: 1978-09-19
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Expires: 1997-07-11
Abstract
Abstract An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttriabase body consisting essentially of yttria and from about 6 to 14 mole percent lanthana.
Inventors
- 👤 William H. Rhodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/50; C04B35/505
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
47 words
An article of manufacture comprising a substantially transparent, high density polycrystalline yttria-based body which is thermodynamically more stable in the environment of a high-pressure sodium vapor lamp than yttria doped with +4 valence ions, consisting essentially of yttria and from about 6 to 14 mole percent lanthana.
Claim 2
Dependent Claim
47 words
An article of manufacture comprising a substantially transparent, high density polycrystalline yttria-based body which is thermodynamically more stable in the environment of a high-pressure sodium vapor lamp than yttria doped with +4 valence ions, consisting essentially of yttria and from about 6 to 14 mole percent lanthana.
Claim 3
Dependent Claim
18 words
An article of manufacture as defined in claim 1 containing from about 8 to 11 mole percent lanthana.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |