Patent US3608042A successfully refreshed from Google Patents.
US3608042A
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Process for producing a film of splitfibre forming polymeric material
Assignee: Individual
•
Filing: 1968-05-29
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Granted: 1971-09-21
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Expires: 1988-05-29
Abstract
Abstract Splitfibre forming polymeric material is extruded through a pleated slot and is then drawn down into flat form while in substantially molten condition so as to produce transverse compression during longitudinal stretching.
Inventors
- 👤 Ole-Bendt Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:06
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
A process as in claim 1, in which the width of said film upon stretching of same does not exceed the direct span of the slot.
Claim 2
Dependent Claim
18 words
A process as in claim 1, in which said slot is circular and constructed with substantially radial pleats.
Claim 3
Dependent Claim
16 words
A process as in claim 1, in which said splitfiber forming material is high density polyethylene.
Claim 4
Dependent Claim
21 words
A process as in claim 1, in which said splitfiber forming material is a randomly mixed dispersion of two incompatible polymers.
Claim 5
Dependent Claim
28 words
A process as in claim 1, in which said splitfiber forming material is polypropylene being mainly isotactic, but also having contents of an atactic modification of the polymer.
Claim 6
Dependent Claim
15 words
A process as in claim 1, in which the pleating ratio is at least 2:1.
Claim 7
Dependent Claim
24 words
A process as in claim 1, in which the draw-down ratio in said molten state is higher than the square of the pleating ratio.
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 |