US4019080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-tight seals between ceramic and aluminium components, evacuated envelopes incorporating the components sealed by said method, and vacuum tubes incorporating said envelopes
Assignee: Thales SA
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Filing: 1974-04-29
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Granted: 1977-04-19
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Expires: 1994-04-29
Abstract
Abstract An evacuated envelope having at least one ceramic component and one aluminum component sealed to one another along a common interface. A metallized layer is on said ceramic component along said interface and a fused solder having an Al-Si eutectic structure with 89% aluminum and 11% silicon is along said interface.
Inventors
- 👤 Andre Besson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:45
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/121; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/402; C04B2237/50; C04B2237/64; C04B2237/76; C04B2237/765; H01J2893/00; H01J2893/0033; H01J2893/0037; Y; Y10; Y10S; Y10S228/00; Y10S228/903
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
49 words
An evacuated envelope, comprising at least one ceramic component and one aluminium component, sealed to one another along a common interface, a metallized layer on said ceramic component along said interface, and a fused solder having an Al-Si eutectic structure with 89% aluminium and 11% silicon along said interface.
Claim 2
Dependent Claim
49 words
An evacuated envelope, comprising at least one ceramic component and one aluminium component, sealed to one another along a common interface, a metallized layer on said ceramic component along said interface, and a fused solder having an Al-Si eutectic structure with 89% aluminium and 11% silicon along said interface.
Claim 3
Dependent Claim
29 words
An evacuated envelope according to claim 1 wherein said envelope is gas tight; said evacuated envelope comprising part of a vacuum tube having electrodes inside said gas tight envelope.
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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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |