US4197957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tight assembly
Assignee: Osram Sylvania Inc
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Filing: 1978-12-26
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Granted: 1980-04-15
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Expires: 1998-12-26
Abstract
Abstract A vacuum-tight assembly such as a discharge tube for a metal vapor arc lamp is formed from a transparent or translucent ceramic composition sealed with a member formed from a vanadium-zirconium alloy or vanadium utilizing a brazing alloy. The vanadium or vanadium alloy and the brazing alloy have thermal coefficients of expansion closely matching that of the ceramic composition.
Inventors
- 👤 Carl F. Buhrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/44; C04B37/00; C04B37/02; C04B37/023; C04B37/026; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; H01J61/366; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/126; C04B2237/127; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/76; C04B2237/765; C04B2237/84; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12806
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A vacuum-tight assembly comprising a high density polycrystalline ceramic body having a cavity and means for sealing said cavity from the atmosphere, said ceramic body being substantially transparent to visible light, and consisting essentially of a compound having a perovskite structure having the formula: ABO 3 , wherein A is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium and mixtures thereof and B is selected from the group consisting of aluminum, scandium, lutecium, and mixtures thereof, said means for sealing comprising at least one closure member formed from vanadium or a vanadium alloy containing up to about 4 weight percent zirconium and a brazing alloy, said closure member and brazing alloy having thermal coefficients of expansion closely matched to the thermal coefficient of expansion of said ceramic body over a wide temperature range.
Claim 2
Dependent Claim
135 words
A vacuum-tight assembly comprising a high density polycrystalline ceramic body having a cavity and means for sealing said cavity from the atmosphere, said ceramic body being substantially transparent to visible light, and consisting essentially of a compound having a perovskite structure having the formula: ABO 3 , wherein A is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium and mixtures thereof and B is selected from the group consisting of aluminum, scandium, lutecium, and mixtures thereof, said means for sealing comprising at least one closure member formed from vanadium or a vanadium alloy containing up to about 4 weight percent zirconium and a brazing alloy, said closure member and brazing alloy having thermal coefficients of expansion closely matched to the thermal coefficient of expansion of said ceramic body over a wide temperature range.
Claim 3
Dependent Claim
9 words
The assembly of claim 1 wherein B is aluminum.
Claim 4
Dependent Claim
9 words
The assembly of claim 1 wherein A is lanthanum.
Claim 5
Dependent Claim
9 words
The assembly of claim 2 wherein A is lanthanum.
Claim 6
Dependent Claim
9 words
The assembly of claim 1 wherein A is cerium.
Claim 7
Dependent Claim
9 words
The assembly of claim 2 wherein A is cerium.
Claim 8
Dependent Claim
12 words
The assembly of claim 1 which is enclosed by a transparent envelope.
Claim 9
Dependent Claim
14 words
The assembly of claim 7 wherein said envelope is formed from a glass composition.
Claim 10
Dependent Claim
21 words
The assembly of claim 1 wherein the sealing member comprises a vanadium-zirconium alloy containing up to about 4 weight percent zirconium.
Claim 11
Dependent Claim
36 words
The assembly of claim 1 wherein the brazing alloy comprises zirconium or titanium containing between about 10 and 35 weight percent of a metal selected from the group consisting of nickel, copper, iron and mixtures thereof.
Claim 12
Dependent Claim
34 words
The assembly of claim 10 wherein the brazing alloy comprises zirconium containing between about 15 and 25 weight percent of a metal selected from the group consisting of nickel and copper and mixtures thereof.
Claim 13
Dependent Claim
34 words
The assembly of claim 4 wherein the brazing alloy comprises zirconium containing between about 15 and 25 weight percent of a metal selected from the group consisting of nickel and copper and mixtures thereof.
Claim 14
Dependent Claim
34 words
The assembly of claim 6 wherein the brazing alloy comprises zirconium containing between about 15 and 25 weight percent of a metal selected from the group consisting of nickel and copper and mixtures thereof.
References Cited (Backward Citations)
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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) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |