Patent US4273822A successfully refreshed from Google Patents.
US4273822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glazing paste for bonding a metal layer to a ceramic substrate
Assignee: Lockheed Martin Corp
•
Filing: 1977-07-18
•
Granted: 1981-06-16
•
Expires: 1997-07-18
Abstract
Abstract A glazing paste comprising glass frit, a metal oxide powder selected from the group consisting of aluminum oxide (Al2O3), magnesium oxide (MgO), calcium oxide (CaO), and zinc oxide, (ZnO), and an organic vehicle.
Inventors
- 👤 Kenneth R. Bube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:12
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C8/16; C03C8/02; C03C8/10; C03C8/12; H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/098; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/256; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31551; Y10T428/31634
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
69 words
A glazing paste comprising: (a) about 80 to about 95 percent by weight of a glass frit; (b) about 5 to about 20 percent by weight of a metal oxide powder selected from the group consisting of aluminum oxide, magnesium oxide, calcium oxide and zinc oxide; and (c) an organic vehicle wherein the glass frit and the metal oxide powder is suspended in the vehicle to form a paste.
Claim 2
Dependent Claim
69 words
A glazing paste comprising: (a) about 80 to about 95 percent by weight of a glass frit; (b) about 5 to about 20 percent by weight of a metal oxide powder selected from the group consisting of aluminum oxide, magnesium oxide, calcium oxide and zinc oxide; and (c) an organic vehicle wherein the glass frit and the metal oxide powder is suspended in the vehicle to form a paste.
Claim 3
Dependent Claim
14 words
A glazing paste according to claim 1 wherein the glass frit is a lead-boro-aluminosilicate.
Claim 4
Dependent Claim
15 words
A glazing paste according to claim 1 wherein the metal oxide powder is aluminum oxide.
Claim 5
Dependent Claim
31 words
A glazing paste according to claim 1 wherein the proportion of the metal oxide powder is about 5 percent by weight and the glass frit is about 95 percent by weight.
Claim 6
Dependent Claim
32 words
A glazing paste according to claim 1 wherein the relative proportion of organic vehicle is about 28 to about 60 parts by weight for each 100 parts by weight of glass frit.
Claim 7
Dependent Claim
18 words
A glazing paste according to claim 1 wherein the organic vehicle is cellulosic material in an organic solvent.
Claim 8
Dependent Claim
21 words
A glazing paste according to claim 1 wherein the metal oxide powder has a median particle size of about 0.05 micrometers.
Claim 9
Dependent Claim
103 words
A hybrid microcircuit device comprising a ceramic substrate, a first glass-rich layer on the substrate and a second metal layer bonded to the substrate by the first layer wherein the first layer is prepared by sintering to the substrate a glazing paste comprising: (a) about 80 to about 95 percent by weight of a glass frit; (b) about 5 to about 20 percent by weight of a metal oxide powder selected from the group consisting of aluminum oxide, magnesium oxide, calcium oxide and zinc oxide; and (c) an organic vehicle wherein the glass frit is suspended in the vehicle to form a paste.
Claim 10
Dependent Claim
103 words
A hybrid microcircuit device comprising a ceramic substrate, a first glass-rich layer on the substrate and a second metal layer bonded to the substrate by the first layer wherein the first layer is prepared by sintering to the substrate a glazing paste comprising: (a) about 80 to about 95 percent by weight of a glass frit; (b) about 5 to about 20 percent by weight of a metal oxide powder selected from the group consisting of aluminum oxide, magnesium oxide, calcium oxide and zinc oxide; and (c) an organic vehicle wherein the glass frit is suspended in the vehicle to form a paste.
Claim 11
Dependent Claim
18 words
A device according to claim 8 wherein the first layer is about 1 to about 4 micrometers thick.
Claim 12
Dependent Claim
17 words
A device according to claim 8 wherein the second layer is about 15 to 22 micrometers thick.
Claim 13
Dependent Claim
21 words
A device according to claim 8 wherein the second layer is selected from the group consisting of gold, platinum, and palladium.
Claim 14
Dependent Claim
13 words
A device according to claim 8 wherein the glass frit is a lead-boro-aluminosilicate.
Claim 15
Dependent Claim
14 words
A device according to claim 8 wherein the metal oxide powder is aluminum oxide.
Claim 16
Dependent Claim
30 words
A device according to claim 8 wherein the proportion of the metal oxide powder is about 5 percent by weight and the glass frit is about 95 percent by weight.
Claim 17
Dependent Claim
31 words
A device according to claim 8 wherein the relative proportion of organic vehicle is about 28 to about 60 parts by weight for each 100 parts by weight of glass frit.
Claim 18
Dependent Claim
17 words
A device according to claim 8 wherein the organic vehicle is cellulosic material in an organic solvent.
Claim 19
Dependent Claim
20 words
A device according to claim 8 wherein the metal oxide powder has a median particle size of about 0.05 micrometers.
References Cited (Backward Citations)
US3060610A
Cited
US3434877A
Cited
US3537892A
Cited
US4050956A
Cited
US3846222A
Cited
US3746568A
Cited
US3770496A
Cited
US3944696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |