US5890504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for transporting a thermally unstable viscous mass
Assignee: Lenzing AG
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Filing: 1996-08-16
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Granted: 1999-04-06
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Expires: 2016-08-16
Abstract
Abstract The invention is concerned with a process for transporting a thermally unstable viscous mass through a pipe having a predetermined breaking point to release excess pressure, which predetermined breaking point breaks when the excess pressure is reached, the excess pressure thus being released, and is characterized in that the predetermined breaking point is provided in the interior of the pipe, provided that the predetermined breaking point is not provided as a portion of the inner wall of the pipe.
Inventors
- 👤 Stefan Zikeli
- 👤 Klaus Weidinger
- 👤 Friedrich Ecker
- 👤 Michael Longin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; F16K17/16; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/1624; Y10T137/1632; Y10T137/1692; Y10T137/1714; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2642
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A method of releasing excess pressure generated during transport of a thermally unstable viscous mass through a pipe comprising the steps of: providing excess pressure responsive means at a location within said pipe and spaced inwardly of the inner wall thereof, and releasing excess pressure occurring at said excess pressure responsive means through the wall of said pipe.
Claim 2
Independent Claim
58 words
A method of releasing excess pressure generated during transport of a thermally unstable viscous mass through a pipe comprising the steps of: providing excess pressure responsive means at a location within said pipe and spaced inwardly of the inner wall thereof, and releasing excess pressure occurring at said excess pressure responsive means through the wall of said pipe.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said excess pressure responsive means is a breaking point that breaks when said excess pressure is reached.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said breaking point is located substantially at the center of said pipe.
Claim 5
Dependent Claim
22 words
The method of claim 2 wherein said breaking point is substantially averted from the transport direction of said mass through said pipe.
Claim 6
Dependent Claim
17 words
The method of claim 2 wherein said breaking point is in the form of a bursting disc.
Claim 7
Independent Claim
27 words
The method of any of claims 1 to 5 in which said thermally unstable viscous mass is a solution of cellulose in an aqueous tertiary amine oxide.
Claim 8
Dependent Claim
75 words
An arrangement for releasing excess pressure generated during transport of a thermally unstable viscous mass through a pipe comprising: a hollow member extending through the wall of said pipe to a point within the pipe spaced from the inner surface thereof; and a bursting disc closing off the end of said hollow member within said pipe and adapted to break upon exposure to excess pressure; whereby said excess pressure is released through said hollow member.
Claim 9
Dependent Claim
75 words
An arrangement for releasing excess pressure generated during transport of a thermally unstable viscous mass through a pipe comprising: a hollow member extending through the wall of said pipe to a point within the pipe spaced from the inner surface thereof; and a bursting disc closing off the end of said hollow member within said pipe and adapted to break upon exposure to excess pressure; whereby said excess pressure is released through said hollow member.
Claim 10
Dependent Claim
28 words
The arrangement of claim 7 wherein the end of said hollow member within said pipe and said bursting disc are disposed substantially at the center of said pipe.
Claim 11
Dependent Claim
24 words
The arrangement of claim 7 or 8 wherein said bursting disc is substantially averted from the transport direction of said mass through said pipe.
References Cited (Backward Citations)
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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) | 2002-04-05 | 2002-10-05 | 2003-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-05 | 2006-10-05 | 2007-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-05 | 2010-10-05 | 2011-04-06 | $7700.00 | Window Closed / Lapsed |