US4563385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid glass cloth for printed circuit boards
Assignee: International Business Machines Corp
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Filing: 1984-06-20
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Granted: 1986-01-07
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Expires: 2004-06-20
Abstract
Abstract Woven glass fiber cloth for printed circuit substrates in which the warp is of plied yarn and the fill is of unplied or twisted yarn to facilitate more thorough polymeric resin impregnation and achieve improved dimensional stability.
Inventors
- 👤 Anilkumar C. Bhatt
- 👤 Donald E. Doran
- 👤 James W. Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:50
CPC Classifications
D; D03; D03D; D03D1/00; D03D1/0082; D03D11/00; D03D15/00; D03D15/20; D03D15/242; D03D15/267; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; D10; D10B; D10B2101/00; D10B2101/02; D10B2101/06; D10B2505/00; D10B2505/02; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/029; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/322; Y10T442/3472; Y10T442/3528; Y10T442/3569
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
A substrate material comprising: a glass woven fabric for printed circuit substrates, wherein the warp yarns are plied yarns and the fill yarns are unplied yarns.
Claim 2
Dependent Claim
26 words
A substrate material comprising: a glass woven fabric for printed circuit substrates, wherein the warp yarns are plied yarns and the fill yarns are unplied yarns.
Claim 3
Dependent Claim
22 words
A substrate material as set forth in claim 1 wherein said warp and fill yarns each contain the same number of filaments.
Claim 4
Dependent Claim
18 words
The substrate material as set forth in claim 1 wherein said material is impregnated with a polymeric resin.
Claim 5
Dependent Claim
19 words
The substrate material as set forth in claim 1 wherein said material is impregnated with a semi-cured polymeric resin.
Claim 6
Dependent Claim
32 words
The substrate material as set forth in claim 1 wherein said material is impregnated with a cured polymeric resin and has at least one electrically conductive circuit secured to a surface thereof.
Claim 7
Dependent Claim
38 words
A substrate material comprising: multiple layers of glass woven fabric for printed circuit substrates impregnated with a polymeric resin wherein the warp yarns are plied yarns and the fill yarns are unplied yarns in each of said layers.
Claim 8
Dependent Claim
38 words
A substrate material comprising: multiple layers of glass woven fabric for printed circuit substrates impregnated with a polymeric resin wherein the warp yarns are plied yarns and the fill yarns are unplied yarns in each of said layers.
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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |