US3596816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrillation method
Assignee: Phillips Petroleum Co
•
Filing: 1969-05-05
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Granted: 1971-08-03
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Expires: 1989-05-05
Abstract
Abstract A method for fibrillating an oriented film or thermoplastic material. The method includes forming elongate lines of weakness in the film and mechanically working the weakened film to promote the splitting up along the lines of weakness.
Inventors
- 👤 Claude V Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:34
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/14; Y10T225/30; Y10T225/307; Y10T225/321
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A method for fibrillating an oriented film of thermoplastic material comprising the steps of: mechanically forming elongated lines of weakness in said film according to a predetermined pattern, said lines of weakness extending substantially parallel to the direction of orientation with each of said lines of weakness comprising at least one indention line on a surface of the film; forming elongated slits through the film with each slit abutting at least one of the lines of indention of the film; and applying a stress to said film having elongated lines of weakness and splitting the film along said lines thereby forming uniformly fibrillated material.
Claim 2
Independent Claim
104 words
A method for fibrillating an oriented film of thermoplastic material comprising the steps of: mechanically forming elongated lines of weakness in said film according to a predetermined pattern, said lines of weakness extending substantially parallel to the direction of orientation with each of said lines of weakness comprising at least one indention line on a surface of the film; forming elongated slits through the film with each slit abutting at least one of the lines of indention of the film; and applying a stress to said film having elongated lines of weakness and splitting the film along said lines thereby forming uniformly fibrillated material.
Claim 3
Dependent Claim
27 words
The method as recited in claim 1 wherein said thermoplastic material is composed of a polymer of 1-olefins, and said film is prepared by a water-quenching technique.
Claim 4
Dependent Claim
26 words
The method as recited in claim 2 wherein said polymer is polypropylene and the orientation of said water-quenched film of polypropylene is about 5:1 or less.
Claim 5
Dependent Claim
30 words
A method, as set forth in claim 1, wherein the film prior to stressing has a pluralIty of lines of weakness each having a length of at least 50 mils.
Claim 6
Independent Claim
101 words
A method for fibrillating an oriented film of thermoplastic material comprising: mechanically forming elongated lines of weakness in said film according to a preselected pattern, said lines of weakness extending substantially parallel to the direction of orientation with each of said lines of weakness comprising at least one indention line on a surface of the film; and applying a stress to said film having elongated lines of weakness in a direction transverse the direction of orientation with said stress being applied by frictionally working the film by oscillating the film in a direction transverse the direction of orientation of the film.
Claim 7
Independent Claim
101 words
A method for fibrillating an oriented film of thermoplastic material comprising: mechanically forming elongated lines of weakness in said film according to a preselected pattern, said lines of weakness extending substantially parallel to the direction of orientation with each of said lines of weakness comprising at least one indention line on a surface of the film; and applying a stress to said film having elongated lines of weakness in a direction transverse the direction of orientation with said stress being applied by frictionally working the film by oscillating the film in a direction transverse the direction of orientation of the film.
Claim 8
Dependent Claim
27 words
The method as recited in claim 5 wherein said thermoplastic material is composed of a polymer of 1-olefins, and said film is prepared by a water-quenching technique.
Claim 9
Dependent Claim
26 words
The method as recited in claim 6 wherein said polymer is polypropylene and the orientation of said water-quenched film of polypropylene is about 5:1 or less.
Claim 10
Dependent Claim
30 words
A method, as set forth in claim 5, wherein the film prior to stressing has a plurality of lines of weakness each having a length of at least 50 mils.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |