US4211758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic compositions and articles prepared therefrom
Assignee: Osram Sylvania Inc
•
Filing: 1978-12-26
•
Granted: 1980-07-08
•
Expires: 1998-12-26
Abstract
Abstract A transparent or translucent article of manufacture such as a discharge tube for a metal vapor arc lamp is formed from a high density ceramic composition having a perovskite structure and having the formula: ABO.sub.3 wherein A can be lanthanum, cerium, praseodymium or neodymium and B has a smaller ionic radius and can be aluminium, scandium, lutecium or the like.
Inventors
- 👤 Carl F. Buhrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/50; C04B35/01; C04B35/44; H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/302
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
An article of manufacture comprising a high density polycrystalline body substantially transparent to visible light, said body consisting essentially of a compound having a perovskite structure and the formula: ABO.sub.3 wherein A is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium and mixture thereof and B is selected from the group consisting of aluminum, scandium, lutecium and mixture thereof.
Claim 2
Dependent Claim
61 words
An article of manufacture comprising a high density polycrystalline body substantially transparent to visible light, said body consisting essentially of a compound having a perovskite structure and the formula: ABO.sub.3 wherein A is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium and mixture thereof and B is selected from the group consisting of aluminum, scandium, lutecium and mixture thereof.
Claim 3
Dependent Claim
11 words
The article of manufacture of claim 1, wherein B is aluminium.
Claim 4
Dependent Claim
11 words
The article of manufacture of claim 1, wherein A is lanthanum.
Claim 5
Dependent Claim
11 words
The article of manufacture of claim 2, wherein A is lanthanum.
Claim 6
Dependent Claim
11 words
The article of manufacture of claim 1, where A is cerium.
Claim 7
Dependent Claim
11 words
The article of manufacture of claim 2, where A is cerium.
Claim 8
Dependent Claim
22 words
The article of manufacture of claim 1, wherein said polycrystalline body is sufficiently transparent to be used as an arc discharge tube.
Claim 9
Dependent Claim
21 words
The article of manufacture of claim 7, wherein said polycrystalline body has a density of at least about 95% theoretical density.
Claim 10
Dependent Claim
15 words
The article of manufacture of claim 8, wherein A is cerium and B is aluminum.
Claim 11
Dependent Claim
15 words
The article of manufacture of claim 8, wherein A is lanthanum and B is aluminum.
Claim 12
Dependent Claim
26 words
The article of manufacture of claim 1, wherein said polycrystalline body is formed into a hollow cylindrical tube suitable for use as an arc discharge tube.
References Cited (Backward Citations)
US3294701A
Cited
US3420780A
Cited
US3545987A
Cited
US3588573A
Cited
US3764643A
Cited
US3640887A
Cited
US3719550A
Cited
US3785992A
Cited
US4098612A
Cited
US4115134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |