Patent US2403698A successfully refreshed from Google Patents.
US3608041A
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Spinning process
Assignee: Celanese Corp
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Filing: 1969-12-17
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Granted: 1971-09-21
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Expires: 1989-12-17
Abstract
Abstract A method of spinning fiber-forming material comprising forming three frustoconical portions, each having an apex angle larger than the foregoing section, and including a cylindrical portion downstream, the frustoconical portions being divergent to the upstream end thereof, said method permitting the production of lower denier material at a lower drawdown with superior mechanical properties and being characterized by ease of mechanical production to minimize jet deposits and prolong jet life.
Inventors
- 👤 Joseph Germano Santangelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:26
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/30; B29C48/345; B29C48/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
21 words
The process of claim 1 wherein said fiber-forming material is a cellulose ester in the form of a spinnable solution thereof.
Claim 2
Dependent Claim
13 words
The process of claim 2 wherein said fiber-forming material is cellulose secondary acetate.
Claim 3
Dependent Claim
12 words
The process of claim 2 wherein said fiber-forming material is cellulose triacetate.
Claim 4
Dependent Claim
34 words
The process of claim 1 wherein said defined apex angle is about 60* to 65*, said second apex angle is about 25 to 35* and said third apex angle is about 12 to 17*.
Claim 5
Dependent Claim
33 words
The process of claim 2 wherein the cellulose ester is dispersed in a solvent comprising a major proportion of methylene chloride and up to about 15 percent by weight of a lower alkanol.
Claim 6
Dependent Claim
23 words
The process of claim 2 wherein the filaments formed are taken up at a linear speed of at least 300 meters per minute.
Claim 7
Dependent Claim
86 words
The process of claim 1 wherein the initial frustoconical stream has a length of about 20 to 30 times the diameter of the cylindrical stream; the intermediate frustoconical stream has a length about 3 to 8 times the diameter of the cylindrical stream; the final frustoconical stream has a length of about one half to 1 times the diameter of the cylindrical stream; said cylindrical stream having a diameter of about 0.025 to 0.50 millimeters and a length about one half to 10 times its diameter.
Claim 8
Dependent Claim
30 words
The process of claim 8 wherein said cylindrical stream has a diameter of up to about 0.060 millimeters and a length about one half to 1 1/2 times its diameter.
Claim 9
Dependent Claim
102 words
The process of claim 9 wherein said cylindrical stream has a circular cross sectional diameter no greater than about 0.034 millimeter and a length of about one half times its diameter, the initial frustoconical stream has an apex angle of about 60* and a length of about 22.5 times the diameter of the cylindrical stream, the intermediate frustoconical stream has an apex angle of about 30* and a length about 6 times the diameter of cylindrical portion, and the final frustoconical stream has an apex angle of about 17* and a length of about one times the diameter of said cylindrical stream.
Claim 10
Dependent Claim
28 words
The process of claim 16 wherein said defined apex angle is about 60*, said second apex angle is about 30* and said third apex angle is about 17*.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |