Patent US4818613A successfully refreshed from Google Patents.
US4818613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single tow prepreg
Assignee: Asahi Kasei Corp
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Filing: 1988-04-15
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Granted: 1989-04-04
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Expires: 2008-04-15
Abstract
Abstract A single tow prepreg which is impregnated with a composition comprising 100 parts by weight of a thermosetting resin having a softening point below 20° C. and 3 to 30 parts by weight of a high molecular weight compound having a glass transition temperature below -10° C. This prepreg is characterized in particular by high flexibility and non-tackiness.
Inventors
- 👤 Shigeki Ohtani
- 👤 Kazuhiro Suzuoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:47
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B38/00; B32B38/08; B32B5/02; C; C08; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J5/244; C08J5/249; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2305/00; B32B2305/07; B32B2305/076; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2971
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A single tow prepreg which is impregnated with a composition comprising 100 parts by weight of a thermosetting resin having a softening point below 20° C. and 3 to 30 parts by weight of a high molecular weight compound having a glass transition temperature below -10° C. selected from the group consisting of polybutadiene, polyisoprene, chloroprene, styrene-butadiene copolymer, an acrylonitrile copolymer, an ethylene/vinyl acetate copolymer, polypropylene glycol, an ethylene glycol/propylene glycol copolymer, epichlorohydrin rubber, acrylic rubber and, polyurethane rubber.
Claim 2
Dependent Claim
79 words
A single tow prepreg which is impregnated with a composition comprising 100 parts by weight of a thermosetting resin having a softening point below 20° C. and 3 to 30 parts by weight of a high molecular weight compound having a glass transition temperature below -10° C. selected from the group consisting of polybutadiene, polyisoprene, chloroprene, styrene-butadiene copolymer, an acrylonitrile copolymer, an ethylene/vinyl acetate copolymer, polypropylene glycol, an ethylene glycol/propylene glycol copolymer, epichlorohydrin rubber, acrylic rubber and, polyurethane rubber.
Claim 3
Dependent Claim
26 words
A prepreg according to claim 1, wherein the single filaments of which the single tow is composed are carbon, glass, aramide, boron or silicon carbide fibres.
Claim 4
Dependent Claim
29 words
A prepreg according to claim 1, wherein the thermosetting resin is an epoxy resin, a phenolic resin, an unsaturated polyester, a epoxy acrylate, a urethane acrylate or a polyimide.
References Cited (Backward Citations)
US4187347A
Cited
US4016022A
Cited
US4126729A
Cited
US4230766A
Cited
US4309473A
Cited
US4446255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |