US4994302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing thick-film devices
Assignee: Hewlett Packard Development Co LP
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Filing: 1989-06-27
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Granted: 1991-02-19
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Expires: 2009-06-27
Abstract
Abstract To produce a layer in a multi-layer circuit structure, a "green ceramic tape" (16) comprising a sheet of particles of ceramic, glass ceramic, or a glass/ceramic composite in an organic binder is applied to a ceramic substrate (12) on which conductive paths (14) have been deposited. A slurry of hollow microspheres (20) is then deposited onto the green ceramic tape (16), and pressure is applied to drive the spheres into the tape. A further tape layer (22) is then applied, and the resultant structure is fired.
Inventors
- 👤 David Kellerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:04
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4644; H05K3/4664; H10; H10W; H10W44/00; H10W44/601; H10W70/00; H10W70/01; H10W70/05; H10W70/60; H10W70/67; H10W70/69; H10W99/00; Y; Y10; Y10S; Y10S264/00; Y10S264/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
54 words
A method of fabricating a multilayer ceramic device comprising the steps of: A. providing a ceramic substrate; B. applying a metal layer to the substrate; C. separately applying to the ceramic substrate over the metal layer (i) a green ceramic tape and (ii) a layer of hollow microspheres; and D. firing the resultant structure.
Claim 2
Independent Claim
54 words
A method of fabricating a multilayer ceramic device comprising the steps of: A. providing a ceramic substrate; B. applying a metal layer to the substrate; C. separately applying to the ceramic substrate over the metal layer (i) a green ceramic tape and (ii) a layer of hollow microspheres; and D. firing the resultant structure.
Claim 3
Dependent Claim
31 words
The method defined in claim 1 wherein the step of applying the green ceramic tape and microspheres comprises applying the green ceramic tape first and then applying the layer of microspheres.
Claim 4
Dependent Claim
22 words
The method defined in claim 2 further including the step of applying further green ceramic tape after applying the layer of microspheres.
Claim 5
Dependent Claim
25 words
The method defined in claim 2 further including laminating the green ceramic tape to the substrate under elevated pressure before applying the layer of microspheres.
Claim 6
Dependent Claim
23 words
The method defined in claim 4 further including the step of pressing the microspheres into the green ceramic tape before the firing step.
Claim 7
Dependent Claim
23 words
The method defined in claim 2 further including the step of pressing the microspheres into the green ceramic tape before the firing step.
Claim 8
Dependent Claim
60 words
The method defined in claim 2 further including the step of applying elevated pressure to the layer of microspheres and green ceramic tape so as simultaneously to laminate the green ceramic tape to the substrate and press the microspheres into the green ceramic tape without having laminated the green ceramic tape to the substrate before applying the layer of microspheres.
Claim 9
Dependent Claim
30 words
The method defined in claim 2 wherein the step of applying the layer of microspheres comprises depositing the microspheres in a slurry of hollow microspheres suspended in an organic vehicle.
Claim 10
Dependent Claim
23 words
The method defined in claim 2 wherein the step of applying the hollow microspheres comprises applying the hollow microspheres alone without a vehicle.
Claim 11
Dependent Claim
24 words
The method defined in claim 2 further including the step of screening a dielectric layer onto the structure after applying the layer of microspheres.
Claim 12
Dependent Claim
30 words
The method defined in claim 1 wherein the step of applying the layer of microspheres comprises depositing the microspheres in a slurry of hollow microspheres suspended in an organic vehicle.
Claim 13
Dependent Claim
23 words
The method defined in claim 1 wherein the step of applying the hollow microspheres comprises applying the hollow microspheres alone without a vehicle.
Claim 14
Independent Claim
71 words
A method of fabricating a multilayer ceramic device comprising the steps of: A. providing a ceramic substrate; B. applying a metal layer to the substrate; C. separately applying to the ceramic substrate over the metal layer (i) a layer of a mixture of an organic plasticizer and particles of a glass ceramic, a glass/ceramic composite, or a ceramic and (ii) a layer of hollow microspheres; and D. firing the resultant structure.
Claim 15
Independent Claim
71 words
A method of fabricating a multilayer ceramic device comprising the steps of: A. providing a ceramic substrate; B. applying a metal layer to the substrate; C. separately applying to the ceramic substrate over the metal layer (i) a layer of a mixture of an organic plasticizer and particles of a glass ceramic, a glass/ceramic composite, or a ceramic and (ii) a layer of hollow microspheres; and D. firing the resultant structure.
Claim 16
Dependent Claim
30 words
The method defined in claim 13 wherein the step of separately applying the mixture and hollow microspheres comprises applying the mixture first and then applying the layer of hollow microspheres.
References Cited (Backward Citations)
US4410874A
Cited
US4134848A
Cited
US4477492A
Cited
US4645552A
Cited
US4781968A
Cited
US4865875A
Cited
US4867935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |