Patent US4851508A successfully refreshed from Google Patents.
US4851508A
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US
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Polyester fibers having high strength and high modulus and process for producing the same
Assignee: TOYO BOEKI 2-8 DOJIMAHAMA 2-CHOME KITA-KU OSAKA-SHI OSAKA-FU JAPAN KK
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Filing: 1987-06-30
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Granted: 1989-07-25
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Expires: 2007-06-30
Abstract
Abstract Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0 and an initial tensile modulus is not less than 130 g/d, said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and tetrachloro ethane (3:1) at 30° C. Processes for producing the fibers are also disclosed.
Inventors
- 👤 Kazuo Kurita
- 👤 Masahiro Hayashi
- 👤 Toshihiko Ohta
- 👤 Hideaki Ishihara
- 👤 Fujio Okada
- 👤 Wataru Yoshikawa
- 👤 Akira Chiba
- 👤 Susumu Tate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:03
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/14; D01F6/00; D01F6/58; D01F6/62; D02; D02J; D02J1/00; D02J1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0, a breaking strength of not less than 11 g/d and an initial tensile modulus of not less than 200 g/d, said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and tetrachloroethane at (3:1) 30° C.
Claim 2
Dependent Claim
63 words
Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0, a breaking strength of not less than 11 g/d and an initial tensile modulus of not less than 200 g/d, said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and tetrachloroethane at (3:1) 30° C.
Claim 3
Dependent Claim
18 words
Polyester fibers according to claim 1, wherein the fibers having an intrinsic viscosity of not less than 1.1.
Claim 4
Dependent Claim
18 words
Polyester fibers according to claim 2, wherein the fibers having an intrinsic viscosity of not less than 1.2.
Claim 5
Dependent Claim
19 words
Polyester fibers according to claim 1, wherein the fibers have a breaking strength of not less than 12 g/d.
Claim 6
Dependent Claim
19 words
Polyester fibers according to claim 4, wherein the fibers have a breaking strength of not less than 13 g/d.
Claim 7
Dependent Claim
20 words
Polyester fibers according to claim 1, wherein the fibers have an initial tensile modulus of not less than 240 g/d.
Claim 8
Dependent Claim
18 words
Polyester fibers according to claim 1, wherein the fibers having melting point of not less than 265° C.
Claim 9
Dependent Claim
19 words
Polyester fibers according to claim 7, wherein the fibers have a melting point of not less than 269° C.
Claim 10
Dependent Claim
70 words
Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0, a breaking strength of not less than 11 g/d, an initial tensile modulus of not less than 130g/d and a melting point of not less than 269° C., said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and (3:1) at 30° C.
Claim 11
Dependent Claim
70 words
Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0, a breaking strength of not less than 11 g/d, an initial tensile modulus of not less than 130g/d and a melting point of not less than 269° C., said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and (3:1) at 30° C.
References Cited (Backward Citations)
US4414169A
Cited
US4433117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |