US4738890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-impregnated base and method of manufacturing same
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1985-10-18
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Granted: 1988-04-19
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Expires: 2005-10-18
Abstract
Abstract A resin-impregnated base of which total quantity of resin absence regions is restricted to be below a predetermined value, whereby a metal-foil coated laminate of the resin-impregnated bases is made obtainable continuously through a hot-compression molding under a low pressure, while restraining in particular void generation to maintain the dimensional change rate of the laminate to be minimum.
Inventors
- 👤 Yasuo Tohrin
- 👤 Tokio Yoshimitsu
- 👤 Hideto Misawa
- 👤 Motoyuki Akamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:24
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/14; B29; B29B; B29B15/00; B29B15/08; B29B15/10; B32B5/00; B32B5/02; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K3/00; H05K3/02; H05K3/022; B29C; B29C37/00; B29C37/006; B29C37/0064; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/029; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/2481; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992; Y10T442/30; Y10T442/3382; Y10T442/3415
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
A resin-impregnated base comprising a base and a resin varnish impregnated and dried in said base, wherein said resin-impregnated base has resin absence regions comprising air bubbles, non-resin-impregnated portions, or mixtures thereof, and wherein the total area of said resin absence regions is less than 0.3% of the overall area of said resin-impregnated base.
Claim 2
Dependent Claim
54 words
A resin-impregnated base comprising a base and a resin varnish impregnated and dried in said base, wherein said resin-impregnated base has resin absence regions comprising air bubbles, non-resin-impregnated portions, or mixtures thereof, and wherein the total area of said resin absence regions is less than 0.3% of the overall area of said resin-impregnated base.
Claim 3
Dependent Claim
25 words
A resin-impregnated base according to claim 1, wherein the number of air bubbles of said resin absence regions is less than 500 pcs/in 2 .
Claim 4
Dependent Claim
33 words
A resin-impregnated base according to claim 1, wherein said base is of a glass cloth having a thickness of 0.10 to 0.30 mm and a weight of 100 to 300 g/m 2 .
Claim 5
Dependent Claim
43 words
A metal-foil laminate comprising a laminate of stacked resin-impregnated bases according to claim 1 with metal foil disposed on one or both surfaces of said stacked bases and wherein said metal foil is bonded through a resin layer to said stacked resin-impregnated bases.
Claim 6
Dependent Claim
21 words
A laminate according to claim 4, wherein said resin layer is provided to be 5 to 100 g/m 2 in weight.
Claim 7
Dependent Claim
68 words
A laminate comprising a plurality of stacked resin-impregnated bases respectively of a base and a resin varnish impregnated and dried in said base, wherein said resin-impregnated bases have respectively resin absence regions the total area of which is less than 0.3% of the overall area of said base, and said stacked resin-impregnated bases are joined as hot-compression molded under a pressure of 1 to 40 Kg/cm 2 .
Claim 8
Dependent Claim
68 words
A laminate comprising a plurality of stacked resin-impregnated bases respectively of a base and a resin varnish impregnated and dried in said base, wherein said resin-impregnated bases have respectively resin absence regions the total area of which is less than 0.3% of the overall area of said base, and said stacked resin-impregnated bases are joined as hot-compression molded under a pressure of 1 to 40 Kg/cm 2 .
Claim 9
Independent Claim
69 words
A method of manufacturing a resin-impregnated base comprising the steps of impregnating a base with resin varnish, and drying said base after said impregnating step, wherein said resin-impregnated base has resin absence regions comprising air bubbles, non-resin-impregnated portions, or mixtures thereof, and wherein the total area of said resin absence regions is made to be less than 0.3% of the overall area of the base at the impregnating step.
Claim 10
Independent Claim
69 words
A method of manufacturing a resin-impregnated base comprising the steps of impregnating a base with resin varnish, and drying said base after said impregnating step, wherein said resin-impregnated base has resin absence regions comprising air bubbles, non-resin-impregnated portions, or mixtures thereof, and wherein the total area of said resin absence regions is made to be less than 0.3% of the overall area of the base at the impregnating step.
Claim 11
Dependent Claim
30 words
A method according to claim 7, wherein said impregnating step includes an immersing of said base in a resin varnish bath and a pressing of the base in said bath.
Claim 12
Dependent Claim
20 words
A method according to claim 8, wherein said impregnating step further includes a releasing within said bath of said pressing.
Claim 13
Dependent Claim
25 words
A method according to claim 7, wherein said impregnating step includes an immersing of said base in a resin varnish bath kept under a vacuum.
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |