US4707231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing composite materials and products obtained with said process
Assignee: Pradom Ltd
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Filing: 1985-09-19
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Granted: 1987-11-17
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Expires: 2005-09-19
Abstract
Abstract The present invention relates to a process for the preparation of a composite material wherein the element used to reinforce the composite material is subjected to an electrostatic field induced by a high voltage electric current, said element being then impregnated with a liquid matrix material or precursor of matrix, while still under the influence of said field, and to the composite materials obtained by carrying out said process.
Inventors
- 👤 Michel Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:34
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29C70/14; B29B; B29B15/00; B29B15/08; B29C70/16; B29C70/20; B29D; B29D30/00; B29D30/06; B29D30/38; C; C04; C04B; C04B20/00; C04B20/0048; C04B20/02; C04B35/00; C04B35/01; C04B35/14; C04B35/71; C04B35/78; C04B35/80; C04B35/82; C08; C08J; C08J5/00; C08J5/04; C08J5/06; H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/26; H01M4/28; H01M4/29; H01M4/64; H01M4/70; H01M4/80; H01M4/86; H01M4/96; B29B15/10; B29C35/00; B29C35/02; B29C35/04; B29C35/045; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/48; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/524; C04B2235/5248; C04B2235/60; C04B2235/605; C04B2235/616; C08J2375/00; C08J2375/04; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T428/2916; Y10T428/2918; Y10T428/292
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
Process for the preparation of a composite material that includes fibers used to reinforce the composite material comprising the steps of: subjecting the fibers to an electrostatic field induced by a high-voltage alternating electric current for a time interval sufficient to cause a modification of the surface of said fibers; and impregnating said fibers after the elapse of said time interval with a liquid matrix material or precursor of matrix, while still under the influence of said field, thereby consolidating bonding between the fibers and the matrix.
Claim 2
Dependent Claim
87 words
Process for the preparation of a composite material that includes fibers used to reinforce the composite material comprising the steps of: subjecting the fibers to an electrostatic field induced by a high-voltage alternating electric current for a time interval sufficient to cause a modification of the surface of said fibers; and impregnating said fibers after the elapse of said time interval with a liquid matrix material or precursor of matrix, while still under the influence of said field, thereby consolidating bonding between the fibers and the matrix.
Claim 3
Dependent Claim
121 words
A process for the preparation of a composite material that includes fibers used to reinforce the composite material comprising the steps of: subjecting the fibers to a first electrostatic field that is induced by a first high-voltage electric current for a first non-zero time interval; subjecting the fibers to a second electrostatic field different from said first electrostatic field that is induced by a second high-voltage electric current for a second non-zero time interval after subjecting the fibers to said first electrostatic field; and impregnating said fibers with a liquid matrix or precursor of matrix, after the elapse of said two time intervals, while still under the influence of said second field thereby consolidating bonding between the fibers and the matrix.
Claim 4
Dependent Claim
121 words
A process for the preparation of a composite material that includes fibers used to reinforce the composite material comprising the steps of: subjecting the fibers to a first electrostatic field that is induced by a first high-voltage electric current for a first non-zero time interval; subjecting the fibers to a second electrostatic field different from said first electrostatic field that is induced by a second high-voltage electric current for a second non-zero time interval after subjecting the fibers to said first electrostatic field; and impregnating said fibers with a liquid matrix or precursor of matrix, after the elapse of said two time intervals, while still under the influence of said second field thereby consolidating bonding between the fibers and the matrix.
Claim 5
Dependent Claim
38 words
The process as claimed in claim 2, wherein one of said first and second fields is induced by a D.C. electric current and the other of said first and second fields is induced by an A.C. electric current.
Claim 6
Dependent Claim
37 words
The process as claimed in claim 3, wherein said D.C. electric current is at a voltage equal to at least 40,000 volts and said A.C. electric current is at a voltage equal to at least 20,000 volts.
Claim 7
Dependent Claim
32 words
The process is claimed in claim 3, wherein said fibers are a dielectric material selected from the group consisting of polyamine fibers, glass fibers, metallic oxide fibers, carbon fibers, and combinations thereof.
Claim 8
Dependent Claim
11 words
Composite materials obtained by carrying out the process of claim 1.
References Cited (Backward Citations)
GB816285A
Cited
US3073732A
Cited
US3626041A
Cited
US3745104A
Cited
US3767505A
Cited
JPS5029939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |