Patent US4619836A successfully refreshed from Google Patents.
US4619836A
Expired / Lapsed
US
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Method of fabricating thick film electrical components
Assignee: Lockheed Martin Corp
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Filing: 1985-12-31
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Granted: 1986-10-28
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Expires: 2005-12-31
Abstract
Abstract A method is disclosed for fabricating thick film electrical components which are exceptionally uniform in electrical properties and have increased density wherein a thick film ink comprised of (i) an organic vehicle which is reactive with a plasma to form gaseous reaction products at a temperature below its thermal decomposition temperature, (ii) a glass frit having a glass transition temperature above the thermal degradation temperature, and (iii) a particulate material having the desired electrical properties for the thick film electrical component are applied to a suitable substrate in a pattern corresponding to the electrical component. The applied layer is then subjected to a suitable plasma at a temperature below the thermal degradation temperature for a time sufficient to remove the organic vehicle from the applied layer. The resultant layer is then heated at or above the glass transition temperature of the glass frit until the glass frit fuses and forms a composite with the particulate material.
Inventors
- 👤 Ashok N. Prabhu
- 👤 Edward J. Conlon
- 👤 Franco N. Sechi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:18
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/12; H05K3/1283; H05K3/1291; H10; H10D; H10D84/00; H10D84/01; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K2203/00; H05K2203/09; H05K2203/095; H05K2203/11; H05K2203/1126
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
A method for fabricating a thick film electrical component on the surface of a substrate comprising the steps of: (a) providing a thick film ink composition comprised of (i) an organic vehicle which is reactive with a suitable plasma to form gaseous reaction products at a temperature below the thermal decomposition temperature of the organic vehicle, (ii) a glass frit having a glass transition temperature above the thermal decomposition temperature of the organic vehicle, and (iii) a particulate material for imparting a predetermined electrical property to the electrical component; (b) forming a patterned layer of the thick film ink on the surface of the substrate; (c) subjecting the layer to a suitable plasma at a temperature below the thermal decomposition temperature of the organic vehicle for a time sufficient to remove the organic vehicle from the layer; and (d) firing the resulting layer of glass frit and particulate material at or above the glass transition temperature of the glass frit until the glass frit fuses.
Claim 2
Independent Claim
165 words
A method for fabricating a thick film electrical component on the surface of a substrate comprising the steps of: (a) providing a thick film ink composition comprised of (i) an organic vehicle which is reactive with a suitable plasma to form gaseous reaction products at a temperature below the thermal decomposition temperature of the organic vehicle, (ii) a glass frit having a glass transition temperature above the thermal decomposition temperature of the organic vehicle, and (iii) a particulate material for imparting a predetermined electrical property to the electrical component; (b) forming a patterned layer of the thick film ink on the surface of the substrate; (c) subjecting the layer to a suitable plasma at a temperature below the thermal decomposition temperature of the organic vehicle for a time sufficient to remove the organic vehicle from the layer; and (d) firing the resulting layer of glass frit and particulate material at or above the glass transition temperature of the glass frit until the glass frit fuses.
Claim 3
Dependent Claim
24 words
In the method according to claim 1 wherein the organic vehicle is reactive with an oxidizing plasma and said plasma is an oxygen-containing plasma.
Claim 4
Dependent Claim
14 words
In the method acording to claim 2 wherein the plasma is an oxygen plasma.
Claim 5
Dependent Claim
24 words
In the method according to claim 1 wherein the organic vehicle is reactive with a reducing plasma and said plasma is a hydrogen-containing plasma.
Claim 6
Dependent Claim
48 words
In the method according to claim 1 wherein the organic vehicle is reactive with an oxidizing plasma and the particulant material is readily oxidizable comprising after step (c) the step of subjecting the layer to a reducing plasma until the particulate material is in a substantially unoxidized state.
Claim 7
Dependent Claim
16 words
The method according to claim 5 wherein the organic vehicle is removed with an oxidizing plasma.
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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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |