US4236952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sheet materials
Assignee: Imperial Chemical Industries Ltd
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Filing: 1978-12-01
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Granted: 1980-12-02
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Expires: 1998-12-01
Abstract
Abstract A method of joining together a sheet or sheets of an organic polymer which is not normally melt-processable, e.g. polytetrafluoroethylene, the method comprising the steps of (a) contacting a strip of melt-processable organic polymer, e.g. fluorinated ethylene/propylene copolymer, with the faces of the sheet or sheets in the region of juxtaposed edges of the sheet or sheets, (b) stitching the strip to the sheet or sheets by means of a thread, and (c) heating the strip in order to fuse the strip and/or the thread to seal the holes created by the stitching step, and, where the strip has not previously been fused to the faces of the sheet or sheets, in order to fuse the strip to the faces of the sheet or sheets. Preferably, the thread is of a melt-processable fluorine-containing polymer and a gauze is placed in contact with and stitched to the faces of the sheets opposite from the faces contacted with the strip of melt-processable organic polymer. The joined sheets, when porous, may be used as diaphragms in electrolytic cells.
Inventors
- 👤 Janusz J. H. Krause
- 👤 Colin Stanier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/02; B; B29; B29C; B29C65/00; B29C65/72; B29C66/00; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C65/02; B29C65/56; B29C65/62; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/114; B29C66/1142; B29C66/70; B29C66/71; B29C66/72; B29C66/727; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29L; B29L2031/00; B29L2031/34; B29L2031/3468; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038; Y10T428/00; Y10T428/24; Y10T428/24033; Y10T428/24041; Y10T428/2405; Y10T428/24802; Y10T428/2481; Y10T428/24843; Y10T428/24851; Y10T428/2486; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A method of joining together a sheet or sheets of an organic polymer which polymer is not normally melt-processable, the method comprising the steps of (a) contacting a strip of melt-processable organic polymer with the faces of the sheet or sheets in the region of juxtaposed edges of the sheet or sheets, (b) stitching the strip to the sheet or sheets by means of a thread in the region of both of the juxtaposed edges of the sheet or sheets, and (c) heating the strip in order to fuse the strip and/or the thread to seal the holes created by the stitching step, and, where the strip has not previously been fused to the faces of the sheet or sheets, in order to fuse the strip to the faces of the sheet or sheets.
Claim 2
Independent Claim
134 words
A method of joining together a sheet or sheets of an organic polymer which polymer is not normally melt-processable, the method comprising the steps of (a) contacting a strip of melt-processable organic polymer with the faces of the sheet or sheets in the region of juxtaposed edges of the sheet or sheets, (b) stitching the strip to the sheet or sheets by means of a thread in the region of both of the juxtaposed edges of the sheet or sheets, and (c) heating the strip in order to fuse the strip and/or the thread to seal the holes created by the stitching step, and, where the strip has not previously been fused to the faces of the sheet or sheets, in order to fuse the strip to the faces of the sheet or sheets.
Claim 3
Dependent Claim
18 words
A method as claimed in claim 1 in which the thread is made of a melt-processable organic polymer.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 1 or claim 2 in which opposite edges of a sheet of non melt-processable organic polymer of square or oblong shape are joined to form a tubular or sleeve-like structure.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 1 or claim 2 in which two or more sheets of non melt-processable organic polymer are joined together.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 1 in which the sheets of non melt-processable organic polymer are porous.
Claim 7
Dependent Claim
35 words
A method as claimed in claim 1 in which the sheets of non melt-processable organic polymer contain a particulate filler which may subsequently be removed from the joined sheets to render the joined sheets porous.
Claim 8
Dependent Claim
18 words
A method as claimed in claim 5 in which the non melt-processable organic polymer is a fluorine-containing polymer.
Claim 9
Dependent Claim
14 words
A method as claimed in claim 7 in which the fluorine-containing polymer is polytetrafluoroethylene.
Claim 10
Dependent Claim
17 words
A method as claimed in claim 1 in which the melt-processable organic polymer is a fluorine-containing polymer.
Claim 11
Dependent Claim
17 words
A method as claimed in claim 9 in which the fluorine-containing polymer is a fluorinated ethylene/propylene copolymer.
Claim 12
Dependent Claim
32 words
A method as claimed in claim 1 in which the strip of melt-processable organic polymer is fused to the sheet or sheets of non melt-processable organic polymer before effecting the stitching step.
Claim 13
Dependent Claim
52 words
A method as claimed in claim 1 in which the faces of the sheet or sheets of the non melt-processable organic polymer opposite from the faces contacted with a strip of melt-processable organic polymer are themselves contacted with a gauze, and in which the stitching passes around the fibres of the gauze.
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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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |