Patent US4305983A successfully refreshed from Google Patents.
US4305983A
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Thin walled tubing formed of a melt spinnable synthetic polymer and process for the manufacturing thereof
Assignee: Akzo NV
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Filing: 1979-09-21
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Granted: 1981-12-15
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Expires: 1999-09-21
Abstract
Abstract Thin walled tubing formed of a melt spinnable synthetic polymer having a flow-through cross-section amounting to 30 to 95% of the total tubular cross-section and a breaking elongation of less than 100% prepared by melt spinning a synthetic polymer so as to form a tube and then drawing off the tube thus formed at a velocity which is greater than 3500 m/min. Preferably the process is carried out under utilization of the phenomena of natural fiber bending whereby the distance between the spinning means and the take-off means can be decreased.
Inventors
- 👤 Hans J. Hoppe
- 👤 Karl Ostertag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; B; B01; B01D; B01D69/00; B01D69/08; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/139; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2935; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
32 words
Thin walled tubing formed of a melt spinnable synthetic polymer having a flow-through cross-section amounting to 30 to 95% of the tubing's total cross-section and a breaking elongation of less than 100%.
Claim 2
Dependent Claim
32 words
Thin walled tubing formed of a melt spinnable synthetic polymer having a flow-through cross-section amounting to 30 to 95% of the tubing's total cross-section and a breaking elongation of less than 100%.
Claim 3
Dependent Claim
21 words
Thin walled tubing according to claim 1, wherein said flow-through cross-section amounts to 60 to 95% of the tubing's total cross-section.
Claim 4
Dependent Claim
24 words
Thin walled tubing according to claim 1, wherein said synthetic polymer is a member selected from the group of polyesters, polyolefins, polyamides and polyvinylchloride.
Claim 5
Dependent Claim
14 words
Thin walled tubing according to claim 3, wherein said synthetic polymer is a polyester.
Claim 6
Dependent Claim
13 words
Thin walled tubing according to claim 4, wherein said synthetic polymer is polyethyleneterephthalate.
Claim 7
Dependent Claim
14 words
Thin walled tubing according to claim 3, wherein said synthetic polymer is a polyolefin.
Claim 8
Dependent Claim
13 words
Thin walled tubing according to claim 6, wherein said synthetic polymer is polypropylene.
Claim 9
Dependent Claim
14 words
Thin walled tubing according to claim 3, wherein said synthetic polymer is a polyamide.
Claim 10
Dependent Claim
13 words
Thin walled tubing according to claim 8, wherein said synthetic polymer is 6,6-polyamide.
Claim 11
Dependent Claim
28 words
Thin walled tubing according to claim 1, wherein said synthetic polymer contains a member selected from the group consisting of micro pore forming agents, fillers and stabilizing agents.
Claim 12
Dependent Claim
17 words
Thin walled tubing according to claim 10, wherein said synthetic polymer contains a micro pore forming agent.
Claim 13
Dependent Claim
37 words
Process for manufacturing the thin walled tubing according to claim 1, which comprises melt spinning a synthetic polymer so as to form a tube and drawing off the formed tubing at a velocity greater than 3500 m/m.
Claim 14
Dependent Claim
15 words
Process according to claim 12, wherein the draw-off velocity amounts to 5000 to 7000 m/min.
Claim 15
Dependent Claim
33 words
Process according to claim 11, which comprises conducting said spinning under utilization of the phenomena of natural fiber bending whereby the distance between the spinning means and the draw-off means can be decreased.
Claim 16
Dependent Claim
44 words
Process according to claim 12, which comprises arranging a deflection plate perpendicular to and below the spinning nozzle at a distance from the spinning nozzle whereby the region of the natural fiber bending is shifted so as to be closer to the spinning nozzle.
Claim 17
Dependent Claim
21 words
Process according to claim 12, which comprises providing a supply of cooling liquid in the region of the natural fiber bending.
Claim 18
Dependent Claim
23 words
Process according to claim 12, which comprises introducing a cavity forming fluid into the tubing as it is being spun from the nozzle.
Claim 19
Dependent Claim
11 words
Process according to claim 17, wherein said fluid is a gas.
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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) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |