US4840826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced plastic solid or hollow molded article
Assignee: Toyobo Co Ltd
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Filing: 1987-09-22
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Granted: 1989-06-20
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Expires: 2007-09-22
Abstract
Abstract A fiber reinforced plastic solid or hollow molded article which comprises a plastic core part (inner part) reinforced with inorganic fibers (A) and a plastic sheath part (outer part) reinforced with polyethylene filaments having high tenacity (B).
Inventors
- 👤 Yoshikazu Shirasaki
- 👤 Kenichi Inuzuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:04
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/28; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29D; B29D23/00; B29K; B29K2223/00; B29K2223/04; B29K2223/06; B29K2307/00; B29L; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393; Y10T428/23; Y10T428/237; Y10T428/24; Y10T428/24744
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
A fiber reinforced plastic solid or hollow molded article which comprises, a plastic core part reinforced with inorganic fibers (A); and a plastic sheath part reinforced with polyenthylene filaments having high tenacity (B), wherein the volume of the fibers (A)/filaments (B) is 75/25 to 95/5 and wherein the high tenacity polyethylene filaments have a tensile strenght of at least 20 g/denier and a tinsel modulus of at least 500 g/denier.
Claim 2
Dependent Claim
70 words
A fiber reinforced plastic solid or hollow molded article which comprises, a plastic core part reinforced with inorganic fibers (A); and a plastic sheath part reinforced with polyenthylene filaments having high tenacity (B), wherein the volume of the fibers (A)/filaments (B) is 75/25 to 95/5 and wherein the high tenacity polyethylene filaments have a tensile strenght of at least 20 g/denier and a tinsel modulus of at least 500 g/denier.
Claim 3
Dependent Claim
14 words
An article according to claim 1, wherein the inorganic fibers (A) are carbon fibers.
Claim 4
Dependent Claim
21 words
An article according to claim 1, wherein the volume content ratio of the filaments (A)/the filaments (B) is 80/20 to 90/10.
Claim 5
Dependent Claim
24 words
An article according to claim 1, wherein the impact absorption energy of the high tenacity polyethylene filaments (B) is at least 40×10 -5 joule/denier.
Claim 6
Dependent Claim
12 words
An article according to claim 1, wherein the core part is hollow.
Claim 7
Dependent Claim
18 words
An article according to claim 1, wherein the article is in the shape of a rod or pipe.
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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |