US3726987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass or ceramic-to-metal seals
Assignee: Olin Corp
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Filing: 1972-02-17
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Granted: 1973-04-10
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Expires: 1992-02-17
Abstract
Abstract Glass or ceramic-to-metal composites or seals wherein the glass or ceramic is bonded to a copper base alloy having a thin film of Al2O3 on its surface. The Al2O3 film comprises at least 10 percent, up to 100 percent, of the oxide film thickness on the metal. The copper base alloy preferably contains 2 to 10 percent aluminum with C.D.A. Alloy 638 being the most preferred alloy. The invention also includes the process of bonding the glasses or ceramics to the metal. Substantial mismatch between the coefficient of thermal expansion of the glasses or ceramics and the copper base alloys may be tolerated in accordance with this invention.
Inventors
- 👤 M Pryor
- 👤 J Popplewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:43
CPC Classifications
C; C23; C23D; C23D5/00; A; A47; A47J; A47J36/00; A47J36/02; B; B32; B32B; B32B15/00; B32B15/04; B32B15/20; B32B17/00; B32B17/06; C03; C03C; C03C27/00; C03C27/02; C22; C22C; C22C9/00; C22C9/01; C23D3/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
In a glass or ceramic-to-metal seal as in claim 1, the further improvement wherein the copper base alloy comprises 2 to 10 percent aluminum, 0.001 to 3 percent silicon and a grain refining element selected from the group consisting of iron up to 4.5 percent, chromium up to 1 percent, zirconium up to 0.5 percent, cobalt up to 1 percent and mixtures thereof, and the balance essentially copper.
Claim 2
Dependent Claim
41 words
In a glass or ceramic-to-metal seal as in claim 2, the further improvement wherein the copper base alloy consists essentially of 2.5 to 3.1 percent aluminum, 1.5 to 2.1 percent silicon, 0.25 to 0.55 percent cobalt, and the balance essentially copper.
Claim 3
Dependent Claim
53 words
In a glass or ceramic-to-metal seal as in claim 3, the further improvement wherein the residual stresses in said glass or ceramic are compressive in nature and wherein the mismatch in coefficient of thermal expansion between the glass or ceramic and the copper base alloy is less than 110 X 10 7 in./in./*C.
Claim 4
Dependent Claim
37 words
In a glass or ceramic-to-metal seal as in claim 3, the further improvement wherein both said metal header and said metal wire are formed of an alloy containing 2 to 10 percent aluminum, the balance essentially copper.
Claim 5
Dependent Claim
67 words
In a glass or ceramic-to-metal seal as in claim 5, the further improvement wherein the copper base alloy comprises 2 to 10 percent aluminum, 0.001 to 3 percent silicon and a grain refining element selected from the group consisting of iron up to 4.5 percent, chromium up to 1percent, zirconium up to 0.5 percent, cobalt up to 1 percent and mixtures thereof, and the balance essentially copper.
Claim 6
Dependent Claim
41 words
In a glass or ceramic-to-metal seal as in claim 6, the further improvement wherein the copper base alloy consists essentially of 2.5 to 3.1 percent aluminum, 1.5 to 2.1 percent silicon, 0.25 to 0.55 percent cobalt and the balance essentially copper.
Claim 7
Dependent Claim
43 words
In a glass or ceramic-to-metal seal as in claim 7, the further improvement wherein a semi-conductor device is secured to the base portion of said metal header and a metal cap is placed over said metal header so as to enclose the semi-conductor.
Claim 8
Dependent Claim
52 words
In a glass or ceramic-to-metal seal as in claim 8, the further improvement wherein residual stresses in said glass or ceramic are compressive in nature and wherein the mismatch in coefficient of thermal expansion between the glass or ceramic and the copper base alloy is less than 110 X 10 7 in./in./*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |