Patent US3673291A successfully refreshed from Google Patents.
US3673291A
Expired / Lapsed
US
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Method for the production of synthetic sheet materials
Assignee: Individual
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Filing: 1968-12-27
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Granted: 1972-06-27
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Expires: 1988-12-27
Abstract
Abstract Method for the production of sheet materials comprising the steps of preparing a fluid lamellar sheet product in which the lamellae are laying in flat sandwich-like arrangement at the surfaces and are perpendicular to the sheet plane in the core zone, setting said sheet product, disrupting the connections between the lamellae in the core zone and separating the sheet product thus formed into two parts in a plane substantially parallel to the sheet plane. In a specific embodiment the fluid sheet product comprises two sets of lamellae, each set forming one surface layer, the lamellae of said two sets being in intermeshing arrangement within the core zone.
Inventors
- 👤 Ole-Bendt Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:05
CPC Classifications
D; D04; D04H; D04H13/00; D04H13/02; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/16; B29C48/18; D01; D01D; D01D5/00; D01D5/42; D01D5/423; B29C48/07; B29C48/08; B29C48/19; B29C48/20; B29C48/21; B29C48/22; Y; Y10; Y10S; Y10S264/00; Y10S264/08; Y10S264/47
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
14 words
A method as in claim 1, wherein said cleaving is effected by cutting action.
Claim 2
Dependent Claim
51 words
A method as in claim 1, further comprising the steps of combing threads out from the lamellae of said first polymeric material while passing the fluid sheet structure through said smearing zone so as to form bundles of threads bonding the lamellae together adjacent at least one surface of the structure.
Claim 3
Dependent Claim
36 words
A method as in claim 1, wherein the streams of said extrudable first polymeric material are extruded so as to form separate lamellae located on opposite sides of the plane of cleavage of the sheet structure.
Claim 4
Dependent Claim
74 words
A method as in claim 1, in which the second extrudable material is also polymeric and further comprising extruding streams of a third extrudable material so as to form lamellae of said third extrudable material disposed in the interior region of said structure and at least partially removing said third extrudable material either during or after the cleavage of the sheet while leaving a substantial part of said second polymeric material in the sheet.
Claim 5
Dependent Claim
24 words
A method as in claim 5, wherein the third extrudable material is incompatible with both the first polymeric material and the second polymeric material.
Claim 6
Dependent Claim
49 words
A method as in claim 5, in which the streams of the third extrudable material are joined with the streams of the first polymeric material and the second polymeric material so as to form a continuous layer of said third extrudable material within the interior region of the sheet.
Claim 7
Dependent Claim
33 words
A method as in claim 5, in which the streams of the second and the third extrudable materials are joined so as to form alternating lamellae within the interior region of the sheet.
Claim 8
Dependent Claim
31 words
A method as in claim 5, wherein the second extrudable material is a finely dispersed mixture of two or more polymers, whereas the third extrudable material is a substantially homogeneous material.
Claim 9
Dependent Claim
66 words
A method as in claim 1, in which the second extrudable material is a further extrudable polymeric material and in which the streams of one of said polymeric materials are of reduced dimension in the direction perpendicular to the sheet surfaces so that the lamellae of the first and the further polymeric material are located in overlapping relationship only in the interior region of the sheet.
Claim 10
Dependent Claim
13 words
A method as in claim 10, wherein the two polymeric materials are incompatible.
Claim 11
Dependent Claim
60 words
A method as in claim 10, further comprising extruding streams of another extrudable material and joining said streams with the streams of the two polymeric materials so as to form a sheet structure in which the lamellae of the first and the further polymeric materials intermesh and are separated in the interior region by lamellae of said other extrudable material.
Claim 12
Dependent Claim
79 words
A method as in claim 1, in which the streams are extruded in a circular row of orifices and wherein the fluid sheet structure before entering said smearing zone is divided into separate segmented streams by a circular row of partitions, said row of partitions and said row of orifices being rotated about a common axis relative to one another, whereafter the streams are united in an annular collecting chamber which is rotated relative to the row of partitions.
Claim 13
Dependent Claim
28 words
A method as in claim 13, wherein both the circular row of orifices and the collecting chamber are in fixed positions and said row of partitions is rotated.
Claim 14
Dependent Claim
37 words
A method as in claim 1, further comprising the step of bonding the two cleaved parts together with the surface layers of the sheet material before separation in adjacent relation and the disrupted interior region facing outwardly.
Claim 15
Dependent Claim
77 words
The method of claim 1 wherein the lamallae of one of said materials terminate short of the lamallae of the other material on at leasT one side of said sheet structure so that a surface layer of the sheet structure is substantially free of said one material on such side, the margins of the lamellae of said other material in said surface layer on passage through said smearing zone being smeared into a generally continuous skin layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |