US4353960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite and conjugate filaments
Assignee: Kureha Corp
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Filing: 1981-02-27
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Granted: 1982-10-12
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Expires: 2001-02-27
Abstract
Abstract The invention provides improved composite and conjugate filaments to be used exclusively in in-water submerged purposes. Each of these filaments consists of a core of vinylidene fluoride resin consisting in turn of one or more filamentary element(s), while a sheath consists of polyamide resin. The composing ratio as measured between the cross-sections of these both resins is defined by a value extending from 1/99-to 40/60, preferably from 3/97 to 30/70, still more preferably between 3/97 and 20/80.
Inventors
- 👤 Hiroyuki Endo
- 👤 Hiroshi Ohhira
- 👤 Tohru Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:49
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D01; D01F; D01F8/00; D01F8/04; D01F8/12; D02G3/22; D02G3/40; D02G3/404; Y; Y10; Y10S; Y10S264/00; Y10S264/26; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/298
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A composite filament for use in in-water submerged services, said filament comprising a core and a sheath surrounding the latter, said core comprising one or a plurality of core filamentary elements(s) made of vinylidene fluoride resin and said sheath being composed of polyamide resin the composing ratio as measured in respective cross-sectional areas of said vinylidene fluoride resin and said polyamide resin being specified within the range from 1/99 to 40/60.
Claim 2
Dependent Claim
71 words
A composite filament for use in in-water submerged services, said filament comprising a core and a sheath surrounding the latter, said core comprising one or a plurality of core filamentary elements(s) made of vinylidene fluoride resin and said sheath being composed of polyamide resin the composing ratio as measured in respective cross-sectional areas of said vinylidene fluoride resin and said polyamide resin being specified within the range from 1/99 to 40/60.
Claim 3
Dependent Claim
25 words
The composite filament as set forth in the foregoing claim 1 wherein said composing ration is in such a range extending from 3/97 to 30/70.
Claim 4
Dependent Claim
26 words
The composite filament as set forth in the foregoing claim 1 wherein the said composing ratio resides in such a range extending from 3/97 to 20/80.
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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |