Patent US4656393A successfully refreshed from Google Patents.
US4656393A
Expired / Lapsed
US
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Metal-to-ceramic butt seal with improved mechanical properties
Assignee: Raytheon Co
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Filing: 1984-10-15
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Granted: 1987-04-07
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Expires: 2004-10-15
Abstract
Abstract Seal (40) between travelling-wave tube electrodes (32 and 34) includes an inner hermetic seal ring (50) for providing vacuum sealing and an outer ring (52) which shares the mechanical stresses due to changes in temperature.
Inventors
- 👤 Kurt Amboss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:31
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/027; H01J23/0275
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
A seal comprising: a ceramic insulator having a surface; a metal electrode; a first seal member and at least one protruding abutment forming a second seal member, said first seal member protruding outward from said metal electrode and contacting said surface of said ceramic insulator and being hermetically sealed to both said electrode and said ceramic insulator, and each said protruding abutment being disposed radially outward from said first seal member, protruding outward from said metal electrode and contacting said surface of said ceramic insulator and being attached to said metal electrode and brazed to said ceramic insulator, each said protruding abutment being positioned with respect to said first seal member so as to divide stress loads therebetween.
Claim 2
Dependent Claim
118 words
A seal comprising: a ceramic insulator having a surface; a metal electrode; a first seal member and at least one protruding abutment forming a second seal member, said first seal member protruding outward from said metal electrode and contacting said surface of said ceramic insulator and being hermetically sealed to both said electrode and said ceramic insulator, and each said protruding abutment being disposed radially outward from said first seal member, protruding outward from said metal electrode and contacting said surface of said ceramic insulator and being attached to said metal electrode and brazed to said ceramic insulator, each said protruding abutment being positioned with respect to said first seal member so as to divide stress loads therebetween.
Claim 3
Dependent Claim
43 words
The seal of claim 1 wherein said first seal member is in the shape of a continuous ring and said protruding abutment is in the shape of a discontinuous ring concentric to said first seal member and having at least one opening therein.
Claim 4
Dependent Claim
21 words
The seal of claim 1 wherein said first seal member and said protruding abutment are integrally formed with said metal electrode.
Claim 5
Dependent Claim
23 words
The seal of claim 3 wherein each said protruding abutment forming said second seal member is positioned radially outside said first seal member.
Claim 6
Dependent Claim
14 words
The seal of claim 4 wherein said metal electrode is a copper-containing metal electrode.
Claim 7
Dependent Claim
16 words
The seal of claim 4 wherein said electrode is a collector electrode in a traveling-wave tube.
Claim 8
Dependent Claim
14 words
The seal of claim 6 wherein said metal electrode is a copper-containing metal electrode.
Claim 9
Dependent Claim
15 words
The seal of claim 1 wherein said electrode is in a hermetically sealed electronic device.
Claim 10
Dependent Claim
109 words
A seal comprising: a metal electrode having a face; first and second seal members secured to and protruding outwardly from said face, said second seal member being positioned adjacent to and radially outward from said first seal member, said seal members terminating in a plane away from said face; a ceramic insulator member having a flat surface thereon, said first and second seal members both lying adjacent to and contacting said flat surface of said insulator member and being brazed thereto so as to form a seal between said electrode and said insulator member with said seal members sharing the mechanical stresses between said electrode and said ceramic member.
Claim 11
Dependent Claim
109 words
A seal comprising: a metal electrode having a face; first and second seal members secured to and protruding outwardly from said face, said second seal member being positioned adjacent to and radially outward from said first seal member, said seal members terminating in a plane away from said face; a ceramic insulator member having a flat surface thereon, said first and second seal members both lying adjacent to and contacting said flat surface of said insulator member and being brazed thereto so as to form a seal between said electrode and said insulator member with said seal members sharing the mechanical stresses between said electrode and said ceramic member.
Claim 12
Dependent Claim
25 words
The seal of claim 9 wherein each of said seal members is a seal ring with said second seal ring embracing said first seal ring.
Claim 13
Dependent Claim
25 words
The seal of claim 10 wherein said second seal ring is discontinuous to permit communication from the space between said seal rings to the exterior.
Claim 14
Dependent Claim
63 words
The seal of claim 10 wherein the length of said seal members between said face of said electrode and said surface on said insulator member is sufficiently long so that stresses are insufficient to cause cracking of said ceramic member in temperature ranges from 1,000° C. to 0° C. and wherein said seal members share the mechanical stress due to those temperature changes.
Claim 15
Dependent Claim
63 words
The seal of claim 9 wherein the length of said seal members between said face of said electrode and said surface on said insulator member is sufficiently long so that stresses are insufficient to cause cracking of said ceramic member in temperature ranges from 1,000° C. to 0° C. and wherein said seal members share the mechanical stress due to those temperature changes.
Claim 16
Dependent Claim
31 words
The seal of claim 12 wherein said electrode is an electrode in the collector of a traveling-wave tube and said insulator member separates said electrode from the adjacent traveling-wave tube structure.
Claim 17
Dependent Claim
20 words
The seal of claim 14 wherein there is a plurality of said seals in said collector of said traveling-wave tube.
Claim 18
Dependent Claim
19 words
The seal of claim 9 wherein said first and second seal members are formed integrally with said metal electrode.
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) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |