US4522884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of melt spinning polypropylene and novel rough surfaced fibres produced thereby
Assignee: Imperial Chemical Industries Ltd
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Filing: 1982-04-02
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Granted: 1985-06-11
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Expires: 2002-04-02
Abstract
Abstract A process of melt spinning polypropylene with a wind up speed of less than 1000 meters per minute in which there is added to the polypropylene a small proportion of a polymer capable of forming an anisotropic melt in the temperature range at which the polypropylene may be melt spun and novel rough surface fibres of polypropylene containing between 0.1% and 10% by weight of the aforementioned polymer.
Inventors
- 👤 Harry Brody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:29
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; D01F6/44; D01F6/46; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
Fibres of polypropylene having a rough surface containing a small proportion of a polymer capable of forming an anisotropic melt in the temperature range at which polypropylene may be melt spun.
Claim 2
Dependent Claim
31 words
Fibres of polypropylene having a rough surface containing a small proportion of a polymer capable of forming an anisotropic melt in the temperature range at which polypropylene may be melt spun.
Claim 3
Dependent Claim
22 words
Fibres of polypropylene having a rough surface as claimed in claim 1 containing between 0.1% and 10% by weight of the polymer.
Claim 4
Dependent Claim
25 words
Fibres of polypropylene having a rough surface as claimed in either claim 1 or claim 2 containing copoly chloro 1,4 phenylene ethylene dioxy 4,4' dibenzoate/terephthalate.
Claim 5
Dependent Claim
20 words
Fibres of polypropylene having a rough surface as claimed in either claim 1 or claim 2 containing copoly ethylene terephthalate/p-oxybenzoate.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |