US4732636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a prepreg having improved dimensional stability
Assignee: International Business Machines Corp
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Filing: 1986-05-23
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Granted: 1988-03-22
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Expires: 2006-05-23
Abstract
Abstract Shrinking of partially cured or B-staged resin coated fabric, also known as prepreg, during C-staging or full curing is reduced by cutting at least a plurality of the warp of the fabric in at least one location before C-staging. Prepreg is useful in the computer industry in the manufacture of printed circuit boards.
Inventors
- 👤 Kenneth J. Varker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:55
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/005; B29B; B29B15/00; B29B15/08; B29B15/10; B29B15/12; B29B15/122; B29B15/125; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/54; B29C70/545; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K3/00; H05K3/0011; B29C2793/00; B29C2793/0045; B29K; B29K2105/00; B29K2105/24; B29K2105/243; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/029; H05K2203/00; H05K2203/02; H05K2203/0228; H05K2203/10; H05K2203/107; H05K2203/11; H05K2203/1105; H05K3/0017; H05K3/0026; H05K3/46; H05K3/4611; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1062; Y10T156/12; Y10T156/13; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24314
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
94 words
A method for manufacturing substantially planar panels of resin-impregnated fabric, whereby shrinkage thereof during manufacture is reduced, the steps comprising: (a) providing a substantially planar fabric having a warp; (b) coating said fabric with a curable resin; (c) partially curing said resin; (d) cutting said partially cured resin-impregnated fabric into panels having outer boundaries; (e) after said partial curing step, transversely cutting at least a plurality of said fabric warp within said outer boundaries of said panels at at least one location; and (f) after transversely cutting said fabric warp, fully curing said resin.
Claim 2
Independent Claim
94 words
A method for manufacturing substantially planar panels of resin-impregnated fabric, whereby shrinkage thereof during manufacture is reduced, the steps comprising: (a) providing a substantially planar fabric having a warp; (b) coating said fabric with a curable resin; (c) partially curing said resin; (d) cutting said partially cured resin-impregnated fabric into panels having outer boundaries; (e) after said partial curing step, transversely cutting at least a plurality of said fabric warp within said outer boundaries of said panels at at least one location; and (f) after transversely cutting said fabric warp, fully curing said resin.
Claim 3
Dependent Claim
18 words
The method in accordance with claim 1 wherein portions of the weft of said fabric are also cut.
Claim 4
Dependent Claim
22 words
The method in accordance with claim 1 wherein said warp is cut along at least one line which is substantially perpendicular thereto.
Claim 5
Dependent Claim
17 words
The method in accordance with claim 3 wherein said warp is cut completely through at noncontiguous locations.
Claim 6
Dependent Claim
55 words
The method in accordance with claim 1 wherein, after said warp cutting step (e) and prior to said fully curing step (f), the substantially planar panel is laminated with at least one other planar member selected from the group consisting of other substantially similar panels and a conductive metal in order to form a laminate.
Claim 7
Dependent Claim
25 words
The method in accordance with claim 1 wherein prior to said fully curing step (f) at least one through hole is made in said panel.
Claim 8
Dependent Claim
15 words
The method in accordance with claim 6 wherein a pattern of through holes is made.
Claim 9
Dependent Claim
27 words
The method in accordance with claim 5 wherein after lamination and before said fully curing step (f) at least one through hole is made in said laminate.
Claim 10
Dependent Claim
21 words
The method is accordance with claim 1 wherein a printed circuit is applied to at least one surface of said panel.
Claim 11
Dependent Claim
27 words
The method in accordance with claim 5 wherein said laminate has at least one outer surface of said substantially similar panel having a printed circuit applied thereto.
Claim 12
Dependent Claim
19 words
The method in accordance with claim 1 wherein said warp cutting step (e) is accomplished by a knife edge.
Claim 13
Dependent Claim
21 words
The method in accordance with claim 1 wherein said warp cuting step (e) is accomplished by the application of laser radiation.
Claim 14
Dependent Claim
14 words
The method in accordance with claim 1 wherein the fabric comprises a glass cloth.
Claim 15
Dependent Claim
18 words
The method in accordance with claim 1 wherein said curable resin comprises an epoxy resin curable by heat.
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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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |