US4661301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing laminate board containing uniformly distributed filler particles
Assignee: Toray Industries Inc
•
Filing: 1985-08-14
•
Granted: 1987-04-28
•
Expires: 2005-08-14
Abstract
Abstract A process for continuously molding a plate for an electrical printed circuit board wherein a resin containing uniformly distributed hollow microspheres having a specific gravity different from that of the resin is extruded into a vertically disposed moving double belt press maintained at a temperature which allows the extruded plate to harden almost completely. The plate exists the vertically disposed press maintaining a flexibility sufficient to be passed around a roller into a horizonal position where subsequent processing steps may be applied, such as lamination of reinforcing fiber and coating with a conductive material.
Inventors
- 👤 Reisuke Okada
- 👤 Hisami Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:55
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/20; B32B27/12; B32B15/00; B32B15/14; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; H05K1/0373; B32B2262/00; B32B2262/10; B32B2262/101; B32B2457/00; B32B2457/08; H05K1/0366; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0242; H05K2201/0254; Y; Y10; Y10S; Y10S264/00; Y10S264/06; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49126; Y10T29/49155; Y10T29/49158
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A process for continuous molding of a plate for an electrical printed circuit board comprising a resin and hollow microspheres uniformly distributed in said resin, wherein the hollow microspheres have a specific gravity different from that of the resin, comprising the step of: extruding a mixture of a resin and hollow microspheres into a vertically disposed moving double belt press maintained at a temperature which allows the extruded plate to harden almost completely.
Claim 2
Dependent Claim
73 words
A process for continuous molding of a plate for an electrical printed circuit board comprising a resin and hollow microspheres uniformly distributed in said resin, wherein the hollow microspheres have a specific gravity different from that of the resin, comprising the step of: extruding a mixture of a resin and hollow microspheres into a vertically disposed moving double belt press maintained at a temperature which allows the extruded plate to harden almost completely.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein subsequent take up of the plate is performed substantially in the horizontal direction.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein the difference in specific gravity between the filler and the resin is more than 0.2.
Claim 5
Dependent Claim
21 words
The Process of claim 1, wherein the difference in specific gravity between the filler and the resin is more than 0.5.
Claim 6
Dependent Claim
20 words
The Process of claim 1, wherein the viscosity of the resin at 25° C. is less than 10 3 poises.
Claim 7
Dependent Claim
20 words
The Process of claim 1, wherein the viscosity of the resin at 25° C. is less than 10 2 poises.
Claim 8
Dependent Claim
18 words
The Process of claim 1, wherein the average size of the filler particle is more than 5 microns.
Claim 9
Dependent Claim
36 words
The process of claim 1, further comprising the steps of laminating preimpregnated reinforcing fibers to said plate on opposite sides thereof and laminating at least one sheet of copper foil to said preimpregnated reinforcing fiber layer.
References Cited (Backward Citations)
US2854372A
Cited
US2993235A
Cited
US3434861A
Cited
US3103406A
Cited
US3257484A
Cited
US3586573A
Cited
US3832426A
Cited
US4518737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |