Patent US4629654A successfully refreshed from Google Patents.
US4629654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylidene fluoride resin monofilament and process for producing the same
Assignee: Kureha Corp
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Filing: 1985-04-29
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Granted: 1986-12-16
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Expires: 2005-04-29
Abstract
Abstract A vinylidene fluoride resin monofilament excellent in tensile strength and knot strength is further improved in abrasion resistance by heat-treating the oriented monofilament for such a short time period as to relax the orientation of only the surface portion of the monofilament. The vinylidene fluoride resin monofilament improved in abrasion resistance is characterized by a lower birefringence at the surface relative to a high average birefringence in a section perpendicular to the axis thereof.
Inventors
- 👤 Tohru Sasaki
- 👤 Hiroyuki Endoh
- 👤 Seiichi Oohira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:14
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; D01D; D01D10/00; D01D10/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
A vinylidene fluoride resin monofilament comprising a vinylidene fluoride resin at least in the surface layer thereof, said monofilament having a birefringence at the surface of 25×10 -3 or less and an average birefringence in a section perpendicular to the axis thereof of 33×10 -3 or greater.
Claim 2
Dependent Claim
47 words
A vinylidene fluoride resin monofilament comprising a vinylidene fluoride resin at least in the surface layer thereof, said monofilament having a birefringence at the surface of 25×10 -3 or less and an average birefringence in a section perpendicular to the axis thereof of 33×10 -3 or greater.
Claim 3
Dependent Claim
21 words
The monofilament according to claim 1, which entirely comprises a vinylidene fluoride resin throughout the section perpendicular to the axis thereof.
Claim 4
Dependent Claim
43 words
The monofilament according to claim 2, which comprises a laminate structure having a surface layer comprising a vinylidene fluoride resin of a lower molecular weight and an interior covered within the surface layer comprising a vinylidene fluoride resin of a higher molecular weight.
Claim 5
Dependent Claim
38 words
The monofilament according to claim 1, which comprises a laminate structure having a surface layer comprising a vinylidene fluoride resin and an interior covered within the surface layer comprising a thermoplastic resin other than the vinylidene fluoride resin.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |