US4076991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing materials for ceramic envelopes
Assignee: General Electric Co
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Filing: 1977-05-06
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Granted: 1978-02-28
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Expires: 1997-05-06
Abstract
Abstract New sealant compositions for sealing end closures or inleads in ceramic envelopes are based on the system Dy 2 O 3 -Al 2 O 3 -SiO 2 . These compositions will withstand metal halides used as arc materials up to temperatures exceeding 1200° C, and make possible more efficient lamps of improved color rendition.
Inventors
- 👤 Ranajit K. Datta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B37/02; C04B37/023; C04B37/025; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/76; C04B2237/765
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
A sealing composition for sealing to ceramics comprising reacted material characterized by proportions of 20-80% by weight Dy 2 O 3 , 0-55% by weight Al 2 O 3 and 5-45% by weight SiO 2 .
Claim 2
Dependent Claim
36 words
A sealing composition for sealing to ceramics comprising reacted material characterized by proportions of 20-80% by weight Dy 2 O 3 , 0-55% by weight Al 2 O 3 and 5-45% by weight SiO 2 .
Claim 3
Dependent Claim
38 words
A sealing composition as defined in claim 1 wherein part of the proportion of Dy 2 O 3 is replaced by Y 2 O 3 , Eu 2 O 3 , Gd 2 O 3 or mixtures thereof.
Claim 4
Dependent Claim
48 words
A sealing composition for sealing alumina, niobium, tantalum, molybdenum of tungsten end closures or inleads to an alumina envelope comprising reacted material characterized by proportions of 20-80% by weight Dy 2 O 3 , 0-55% by weight Al 2 O 3 and 5-45% by weight SiO 2 .
Claim 5
Dependent Claim
48 words
A sealing composition for sealing alumina, niobium, tantalum, molybdenum of tungsten end closures or inleads to an alumina envelope comprising reacted material characterized by proportions of 20-80% by weight Dy 2 O 3 , 0-55% by weight Al 2 O 3 and 5-45% by weight SiO 2 .
Claim 6
Dependent Claim
38 words
A sealing composition as defined in claim 3 wherein part of the proportion of Dy 2 O 3 is replaced by Y 2 O 3 , Eu 2 O 3 , Gd 2 O 3 or mixtures thereof.
Claim 7
Dependent Claim
79 words
An electric discharge device comprising: a generally tubular envelope, of alumina ceramic, closure members in the ends of said envelope, electrodes within said envelope supported by said closure members and having external connections therethrough, and a sealing composition hermetically bonding said closure members to said ceramic envelope, said sealing composition comprising reacted material characterized by proportions of 20-80% by weight Dy 2 O 3 , 0-55% by weight Al 2 O 3 and 5-45% by weight SiO 2 .
Claim 8
Dependent Claim
79 words
An electric discharge device comprising: a generally tubular envelope, of alumina ceramic, closure members in the ends of said envelope, electrodes within said envelope supported by said closure members and having external connections therethrough, and a sealing composition hermetically bonding said closure members to said ceramic envelope, said sealing composition comprising reacted material characterized by proportions of 20-80% by weight Dy 2 O 3 , 0-55% by weight Al 2 O 3 and 5-45% by weight SiO 2 .
Claim 9
Dependent Claim
19 words
A device as defined in claim 5 containing a filling of arc materials including at least one metal halide.
Claim 10
Dependent Claim
41 words
A device as defined in claim 5 wherein one closure member is an alumina plug having an aperture through which an inlead extends to which the electrode is fastened, said inlead being hermetically sealed to said plug by said sealing composition.
Claim 11
Dependent Claim
22 words
A device as defined in claim 5 wherein one closure member is a metal end cap to which the electrode is fastened.
Claim 12
Dependent Claim
36 words
A device as defined in claim 5 wherein part of proportion of Dy 2 O 3 is replaced by Y 2 O 3 , Eu 2 O 3 or Gd 2 O 3 or mixtures thereof.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |