US5252284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing shaped cellulosic articles
Assignee: Lenzing AG
•
Filing: 1992-01-08
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Granted: 1993-10-12
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Expires: 2012-01-08
Abstract
Abstract A cellulosic solution in a amine oxide and water is forced through an elongated orifice passage having a minimum length of 1000 /μm and a minimum diameter along the length which is up to 150 /μm so that fiber characteristics are imparted to the emerging strand which passes through an air gap of at the most 35 mm in length into the coagulating solution.
Inventors
- 👤 Raimund Jurkovic
- 👤 Heinrich Firgo
- 👤 Dieter Eichinger
- 👤 Stefan Zikeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:02
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; D01D5/00; D01D5/06; D01F; D01F2/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A process for producing cellulosic filaments comprising the steps of: (a) extruding under pressure a solution of cellulose in an amine oxide and water through a nozzle orifice having a length of at least 1000 /μm and a minimum diameter along said length of at most 150 /μm to produce a strand of said solution; (b) conducting said strand of said solution across an air gap; and (c) thereafter passing said strand into a coagulating bath thereby solidifying said strand into a cellulosic filament.
Claim 2
Dependent Claim
84 words
A process for producing cellulosic filaments comprising the steps of: (a) extruding under pressure a solution of cellulose in an amine oxide and water through a nozzle orifice having a length of at least 1000 /μm and a minimum diameter along said length of at most 150 /μm to produce a strand of said solution; (b) conducting said strand of said solution across an air gap; and (c) thereafter passing said strand into a coagulating bath thereby solidifying said strand into a cellulosic filament.
Claim 3
Dependent Claim
18 words
The process defined in claim 1 wherein the air gap has a length of at most 35 mm.
Claim 4
Dependent Claim
17 words
The process defined in claim 1 wherein said gap has a length of at most 10 mm.
Claim 5
Dependent Claim
15 words
The process defined in claim 1 wherein said minimum diameter is at most 70 /μm.
Claim 6
Dependent Claim
13 words
The process defined in claim 4 wherein said length is about 1500 /μm
Claim 7
Dependent Claim
29 words
The process defined in claim 1 wherein said orifice has a cylindrical part adjacent an outlet end of said orifice and conically widens therefrom to an inlet end thereof.
Claim 8
Dependent Claim
22 words
The procedure defined in claim 6 wherein said cylindrical part extends about to 1/3 to 1/4 of the length of said orifice.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |