US4430376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-to-metal compression sealed lead-in structure
Assignee: Individual
•
Filing: 1982-07-13
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Granted: 1984-02-07
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Expires: 2002-07-13
Abstract
Abstract A glass-to-metal compression sealed lead-in structure for electronic devices. The structure is constituted by an outer metal case having a high coefficient of thermal expansion (CTE), a lead-in conductor extending through the opening in the case and having a relatively low CTE, and a glass seal filling the space between the conductor and the case and having a relatively low or intermediate CTE. The conductor is fabricated of a machinable metal whose normal CTE is higher than required, the surface of the metal after the conductor is machined to specification, being treated with a substance that acts to reduce the CTE of the conductor to render it compatible with the CTE of the glass seal.
Inventors
- 👤 Leonard J. Box
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:01
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/26; H01B17/30; H01B17/303; H01B17/305; C; C03; C03C; C03C27/00; C03C27/02; H10; H10W; H10W76/00; H10W76/60; Y; Y10; Y10T; Y10T403/00; Y10T403/21; Y10T403/213; Y10T403/217; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/24; Y10T428/24628
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A glass-to-metal compression sealed lead-in structure for electronic devices comprising: A an outer metal case having a high coefficient of thermal expansion; B a lead in conductor of predetermined form extending through the opening in the case, said conductor being formed of steel having a high coefficient of expansion which is machined to the required form of the conductor, the surface of the steel being treated after machining to impart to the conductor a relatively low coefficient of thermal expansion; and C a glass seal filling the space between the conductor and the case and having a coefficient of thermal expansion which is lower than that of the case and no lower than that of the conductor.
Claim 2
Dependent Claim
117 words
A glass-to-metal compression sealed lead-in structure for electronic devices comprising: A an outer metal case having a high coefficient of thermal expansion; B a lead in conductor of predetermined form extending through the opening in the case, said conductor being formed of steel having a high coefficient of expansion which is machined to the required form of the conductor, the surface of the steel being treated after machining to impart to the conductor a relatively low coefficient of thermal expansion; and C a glass seal filling the space between the conductor and the case and having a coefficient of thermal expansion which is lower than that of the case and no lower than that of the conductor.
Claim 3
Dependent Claim
15 words
A structure as set forth in claim 1, wherein said case is formed of steel.
Claim 4
Dependent Claim
14 words
A structure as set forth in claim 1, wherein said stainless steel is non-magnetic.
Claim 5
Dependent Claim
29 words
A structure as set forth in claim 3, wherein the surface of the stainless steel is carburized to an extent imparting thereto the desired low coefficient of thermal expansion.
Claim 6
Dependent Claim
29 words
A structure as set forth in claim 3, wherein the surface of the stainless steel has chromium diffused therein to impart thereto the desired low coefficient of thermal expansion.
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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |