Patent US4445920A successfully refreshed from Google Patents.
US4445920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making glass-to-metal seal (header)
Assignee: United States Department of the Navy
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Filing: 1982-12-20
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Granted: 1984-05-01
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Expires: 2002-12-20
Abstract
Abstract A metal-to-glass-to-metal seal that includes a chemical bond between the ss and metal as well as a mechanical seal is obtained by using an oxide layer which joins the glass and metal. A glass tube or glass powder with a coefficient of expansion which approximates the metal's coefficient of expansion is fitted between a pin and sleeve combination. Parts are then heated in a controlled dry hydrogen atmosphere to create a bond between the metal and glass.
Inventors
- 👤 Rex L. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:21
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103; C; C03; C03C; C03C27/00; C03C27/04; C03C27/042; C03C27/046
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal comprising the steps of: placing a glass rod between a metal sleeve and a metal pin, said glass rod having a coefficient of expansion that approximates said metal pin and metal sleeve; heating said pin, rod, and sleeve to 1050° C. for five minutes in a furnace; and maintaining a dry hydrogen atmosphere in said furnace during said heating step.
Claim 2
Independent Claim
80 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal comprising the steps of: placing a glass rod between a metal sleeve and a metal pin, said glass rod having a coefficient of expansion that approximates said metal pin and metal sleeve; heating said pin, rod, and sleeve to 1050° C. for five minutes in a furnace; and maintaining a dry hydrogen atmosphere in said furnace during said heating step.
Claim 3
Dependent Claim
34 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal as described in claim 1 wherein said metal pin and sleeve comprise stainless steel.
Claim 4
Dependent Claim
45 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal as described in claim 1 where said dry hydrogen atmosphere comprises a hydrogen atmosphere with water vapor content in the range of 5% to 20%.
Claim 5
Dependent Claim
45 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal as described in claim 2 where said dry hydrogen atmosphere comprises a hydrogen atmosphere with water vapor content in the range of 5% to 20%.
Claim 6
Independent Claim
80 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal comprising the steps of: placing a glass powder between a metal sleeve and a metal pin, said glass powder having a coefficient of expansion that approximates said metal pin and metal sleeve; heating said pin, powder, and sleeve to 1050° C. for five minutes in a furnace; and maintaining a dry hydrogen atmosphere in said furnace during said heating step.
Claim 7
Independent Claim
80 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal comprising the steps of: placing a glass powder between a metal sleeve and a metal pin, said glass powder having a coefficient of expansion that approximates said metal pin and metal sleeve; heating said pin, powder, and sleeve to 1050° C. for five minutes in a furnace; and maintaining a dry hydrogen atmosphere in said furnace during said heating step.
Claim 8
Dependent Claim
34 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal as described in claim 4 where said metal pin and sleeve comprise stainless steel.
Claim 9
Dependent Claim
45 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal as described in claim 4 where said dry hydrogen atmosphere comprises a hydrogen atmosphere with water vapor content in the range of 5% to 20%.
Claim 10
Dependent Claim
45 words
A method of forming a three-tier glass and metal component with mechanical and chemical bonds between the glass and metal as described in claim 5 where said dry hydrogen atmosphere comprises a hydrogen atmosphere with water vapor content in the range of 5% to 20%.
References Cited (Backward Citations)
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Cited
US3326618A
Cited
US4352951A
Cited
US4292464A
Cited
US4198225A
Cited
US4377404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |