US3920172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive glass seal assembly
Assignee: Bendix Corp
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Filing: 1974-10-03
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Granted: 1975-11-18
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Expires: 1994-10-03
Abstract
Abstract This invention relates to an improved ceramic to metal conductive glass seal and to a process of forming an oxidation and corrosion resistant conductive glass seal between a ceramic and metal member.
Inventors
- 👤 Seong K Rhee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:51
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; G01N27/4078; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6582; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/345; C04B2237/348; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/52; C04B2237/54; C04B2237/70; C04B2237/708; C04B2237/76; C04B2237/765; C04B2237/84; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49208; Y10T29/4921
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A process for making a hermetic ceramic to metal electrically conductive glass seal assembly comprising: a. disposing a layer of glass between a metal member and a ceramic member; b. disposing a layer of conductive glass atop the layer of glass; c. disposing a layer of glass atop the layer of conductive glass; d. heating the glass layers at an elevated temperature to soften the glass; and e. applying pressure to the softened glass to densify and compact the layers.
Claim 2
Dependent Claim
80 words
A process for making a hermetic ceramic to metal electrically conductive glass seal assembly comprising: a. disposing a layer of glass between a metal member and a ceramic member; b. disposing a layer of conductive glass atop the layer of glass; c. disposing a layer of glass atop the layer of conductive glass; d. heating the glass layers at an elevated temperature to soften the glass; and e. applying pressure to the softened glass to densify and compact the layers.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the glass layers are in powdered form and are heated at a temperature of about 1200*F. for about 30 minutes.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein the glass layers are heated in a nitrogen atmosphere.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein a pressure of at least about 500 p.s.i. is applied to the softened glass layers.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the metal member is stainless steel.
Claim 7
Dependent Claim
48 words
The process of claim 5 wherein those areas of the stainless steel member that are in contact with the non-conductive glass layers have formed thereon a thin oxide film, said film being formed by subjecting the said member to an atmosphere of wet hydrogen at an elevated temperature.
Claim 8
Dependent Claim
28 words
The process of claim 6 wherein the stainless steel member is subjected to said atmosphere of wet hydrogen for about 30 minutes at a temperature of about 1800*F.
Claim 9
Dependent Claim
19 words
The process of claim 6 wherein the oxide film has a thickness of from about 0.05mm to about 5mm.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |