US4770922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board base material
Assignee: Japan Gore Tex Inc
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Filing: 1987-04-13
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Granted: 1988-09-13
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Expires: 2007-04-13
Abstract
Abstract A base material for use in making printed circuit boards is provided wherein minute fragments of expanded, porous polytetrafluoroethylene are uniformly mixed into another resin, and the mixture is compressed to form a composite board. In use, the board has an electrically conductive circuit affixed to at least one surface. The other resin may be epoxy, polyester or other similar resin. Laminates of such base board material affixed to a glass cloth or paper sheet may be prepared. The preferred fragment size range is 0.1 to 5 mm average diameter, and the preferred volume ratio of fragments to resin is 0.5 to 2.0.
Inventors
- 👤 Minoru Hatakeyama
- 👤 Kosuke Moriya
- 👤 Ichiro Komada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/16; B32B27/00; B32B27/32; B32B27/322; B32B25/00; B32B25/10; B32B27/12; B32B27/28; B32B27/281; B32B27/36; B32B27/38; C; C08; C08L; C08L101/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; B32B2307/00; B32B2307/20; B32B2307/202; B32B2315/00; B32B2315/08; B32B2315/085; B32B2317/00; B32B2317/12; B32B2327/00; B32B2327/12; B32B2327/18; B32B2363/00; B32B2367/00; B32B2379/00; B32B2379/08; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0212; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24934; Y10T428/25; Y10T428/254; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T428/31616; Y10T428/31623; Y10T428/31721; Y10T428/31786; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/3878
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A base material for use in making printed circuit boards comprising minute fragments of expanded, porous PTFE uniformly mixed into another resin and compressed to the form of a composite board, wherein said compressed composite board has an electrically conductive circuit affixed to at least one surface thereof.
Claim 2
Dependent Claim
48 words
A base material for use in making printed circuit boards comprising minute fragments of expanded, porous PTFE uniformly mixed into another resin and compressed to the form of a composite board, wherein said compressed composite board has an electrically conductive circuit affixed to at least one surface thereof.
Claim 3
Dependent Claim
11 words
The composite board of claim 1 laminated to a paper sheet.
Claim 4
Dependent Claim
14 words
The composite board of claim 1 wherein said other resin is an epoxy resin.
Claim 5
Dependent Claim
13 words
The composite board of claim 1 wherein said other resin is polyimide resin.
Claim 6
Dependent Claim
14 words
The composite board of claim 1 wherein said other resin is a polyester resin.
Claim 7
Dependent Claim
14 words
The composite board of claim 1 wherein said other resin is a bismaleimide-triazine resin.
Claim 8
Dependent Claim
11 words
The composite board of claim 1 laminated to a glass cloth.
Claim 9
Dependent Claim
22 words
The composite board of claim 1 wherein the particle diameter of said fragments is in the range of 0.1 to 5 mm.
Claim 10
Dependent Claim
22 words
The composite board of claim 1 wherein the particle diameter of said fragments is in the range of 0.5 to 1 mm.
Claim 11
Dependent Claim
20 words
The composite board of claim 1 wherein the volume ratio of fragments to said other resin is 0.5 to 2.
Claim 12
Dependent Claim
20 words
The composite board of claim 1 wherein the volume ratio of fragments to said other resin is 0.8 to 1.2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |