US4339490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced plastic sheet molding compound
Assignee: Mitsubishi Chemical Corp
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Filing: 1980-09-02
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Granted: 1982-07-13
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Expires: 2000-09-02
Abstract
Abstract A fiber-reinforced plastic sheet molding compound comprising a sheet member (A) formed of a resin composition which consists of 30 to 90% by weight of a reinforcing cut fiber and 70 to 10% by weight of a matrix resin, at least one surface of said sheet member (A) being intimately applied to a sheet member (B) which is formed of the matrix resin and which has a thickness thinner than that of sheet member (A).
Inventors
- 👤 Naonori Yoshioka
- 👤 Hisashi Tada
- 👤 Setsuo Kashiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:21
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/38; B32B5/00; B32B5/16; B29K; B29K2307/00; B29K2309/00; B29K2309/08; B32B2262/00; B32B2262/10; B32B2262/106; B32B2305/00; B32B2305/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/25; Y10T428/254; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31511; Y10T428/31525
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A fiber-reinforced plastic sheet molding compound, comprising: a first sheet composed of from 30 to 90% by weight of reinforcing fibers and from 70-10% by weight of a matrix resin, said first sheet being formed of remolded rectangular or triangular ribbon shaped chips of a width of at least 1 mm and a length of at least 3 mm, at least one surface of said first sheet being joined with a second sheet composed of the said matrix resin and from 0-30% by weight of reinforcing fibers, said second sheet having a thickness less than that of said first sheet.
Claim 2
Dependent Claim
100 words
A fiber-reinforced plastic sheet molding compound, comprising: a first sheet composed of from 30 to 90% by weight of reinforcing fibers and from 70-10% by weight of a matrix resin, said first sheet being formed of remolded rectangular or triangular ribbon shaped chips of a width of at least 1 mm and a length of at least 3 mm, at least one surface of said first sheet being joined with a second sheet composed of the said matrix resin and from 0-30% by weight of reinforcing fibers, said second sheet having a thickness less than that of said first sheet.
Claim 3
Dependent Claim
20 words
The sheet molding compound of claim 1, wherein each side of said first sheet is joined to a second sheet.
Claim 4
Dependent Claim
20 words
The sheet molding compound of claim 1 or 2, wherein the reinforcing fibers have a length greater than 1 mm.
Claim 5
Dependent Claim
31 words
The sheet molding compound of claim 1, wherein said ribbon shaped chips forming said first sheet member have a width of from 1-30 mm and a length of from 5-50 mm.
Claim 6
Dependent Claim
17 words
The sheet molding compound of claim 1, 2 or 4, wherein said reinforcing fibers are carbon fibers.
Claim 7
Dependent Claim
22 words
The sheet molding compound according to claim 1, 2 or 4, wherein said matrix resin of both sheets is a thermosetting resin.
Claim 8
Dependent Claim
16 words
The sheet molding compound of claim 6, wherein said thermosetting resin is a B-stage epoxy resin.
Claim 9
Dependent Claim
16 words
The sheet molding compound of claim 6, wherein said thermosetting resin is a diallyl phthalate resin.
Claim 10
Dependent Claim
23 words
The sheet molding compound of claim 1, 2, or 4, wherein said matrix resin of both sheets is a hot melt-type thermosetting resin.
References Cited (Backward Citations)
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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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |