US4617233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stretched polyethylene filaments of high strength and high modulus, and their production
Assignee: Toyobo Co Ltd
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Filing: 1984-05-21
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Granted: 1986-10-14
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Expires: 2004-05-21
Abstract
Abstract Stretched filaments of high strength and high modulus being made of polyethylene of a weight average molecular weight of not less than 3x106 and having a strength of not less than 50 g/d and an initial modulus of not less than 1,500 g/d, the long period structure being substantially not observed, which are prepared by spinning a dilute solution of said polyethylene and stretching the resultant gel-like filaments in multi-stages until the long period structure becomes substantially not observed.
Inventors
- 👤 Toshihiko Ohta
- 👤 Fujio Okada
- 👤 Kiyokazu Okumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:25
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
Stretched polyethylene filaments of high strength and high modulus, characterized by being made of polyethylene of a weight average molecular weight of not less than 3×10 6 , a strength of not less than 50 g/d, an initial modulus of not less than 1,500 g/d, and no observable long period spacing.
Claim 2
Dependent Claim
51 words
Stretched polyethylene filaments of high strength and high modulus, characterized by being made of polyethylene of a weight average molecular weight of not less than 3×10 6 , a strength of not less than 50 g/d, an initial modulus of not less than 1,500 g/d, and no observable long period spacing.
Claim 3
Dependent Claim
25 words
The filaments according to claim 1, wherein the strength is not less than 60 g/d and the initial modulus is not less than 2,000 g/a.
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) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |