Patent US4588464A successfully refreshed from Google Patents.
US4588464A
Expired / Lapsed
US
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Method of producing a fluorocarbon filter element
Assignee: Kurashiki Spinning Co Ltd
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Filing: 1984-05-08
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Granted: 1986-05-13
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Expires: 2004-05-08
Abstract
Abstract The present invention provides a filter element made wholly of fluorocarbons resin, comprising as essential elements a filter material produced by folding a sandwich-form sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of a thermoplastic fluorocarbon resin superimposed on the both surfaces thereof into a pleat form and liquid-tightly welding the edge parts of the both sides of the pleated sheet, sealed end parts produced by embedding the both end parts of said filter material except the central openings into a thermoplastic fluorocarbon resin to force the resin into the pleats, whereby the both end parts are each integrally and tightly welded, and fluorocarbon resin caps welded liquid-tightly with said sealed end parts, and production thereof.
Inventors
- 👤 Tokuya Miyagi
- 👤 Akihisa Inoue
- 👤 Katushi Hamada
- 👤 Shoichi Fujimori
- 👤 Yoshihiro Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:38
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/067; B01D39/00; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D39/14; B01D39/16; B01D39/1692; B01D63/061; B29; B29C; B29C65/00; B29C65/02; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/50; B29C65/5042; B29C65/5057; B29C65/5064; B29C65/5071; B29C65/5078; B29C65/5085; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/135; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5344; B29C66/61; B29C66/612; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/727; B29C66/729; B01D2201/00; B01D2201/04; B01D2201/0407; B29C65/06; B29C65/0672; B29C65/5007; B29C65/5021; B29C66/7294; B29L; B29L2031/00; B29L2031/14; Y; Y10; Y10S; Y10S55/00; Y10S55/05; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A method for producing a filter element made wholly of a fluorocarbon resin characterized by forming sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of thermoplastic fluorocarbon resin superimposed on the both surfaces thereof into a pleat form, bending the pleated sheet into a cylindrical form liquid-tightly welding the edge parts of the adjacent both sides, pre-welding the pleats by heating the both end parts of the cylindrical pleat-form filter to a temperature higher than the melting point of the net supporter, cooling the pre-welded filter, melting a thermoplastic fluorocarbon resin in a circular mold having means defining a central opening, inserting the end parts of the cooled pre-welded pleat into the molten thermoplastic fluorocarbon resin in the circular mold having a central opening to force the resin into the pleats, whereby the end part and the molten resin are integrally welded together, and fitting fluorocarbon resin caps having a prescribed shape in the ends parts of the resulting filter material.
Claim 2
Independent Claim
167 words
A method for producing a filter element made wholly of a fluorocarbon resin characterized by forming sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of thermoplastic fluorocarbon resin superimposed on the both surfaces thereof into a pleat form, bending the pleated sheet into a cylindrical form liquid-tightly welding the edge parts of the adjacent both sides, pre-welding the pleats by heating the both end parts of the cylindrical pleat-form filter to a temperature higher than the melting point of the net supporter, cooling the pre-welded filter, melting a thermoplastic fluorocarbon resin in a circular mold having means defining a central opening, inserting the end parts of the cooled pre-welded pleat into the molten thermoplastic fluorocarbon resin in the circular mold having a central opening to force the resin into the pleats, whereby the end part and the molten resin are integrally welded together, and fitting fluorocarbon resin caps having a prescribed shape in the ends parts of the resulting filter material.
Claim 3
Dependent Claim
37 words
A method as described in claim 1, wherein the edge parts of the both sides of the pleat-form filter are welded together by inserting a welding tape made of a thermoplastic fluorocarbon resin between the edge parts.
Claim 4
Dependent Claim
15 words
A method as described in claim 1, wherein the filter membrane is made of PTFE.
Claim 5
Dependent Claim
18 words
A method as described in claim 1, wherein the net supporter is made of PFA, FEP or EPE.
Claim 6
Dependent Claim
20 words
A method as described in claim 1, wherein the resin for welding the end parts is PFA, FEP or EPE.
Claim 7
Dependent Claim
18 words
A method as described in claim 1, wherein the cap is made of PTFE, FEP, PFA or EPE.
Claim 8
Dependent Claim
18 words
A method as described in claim 1, wherein at least one of the caps has a central opening.
Claim 9
Dependent Claim
45 words
A method as described in claim 1, wherein the element is provided with an additional fluorocarbon resin core material for supporting the filter membrane material, inside the central opening of the filter element, and then integrally welding two or three of the assembly thus obtained.
References Cited (Backward Citations)
US3457339A
Cited
US3716436A
Cited
US3752321A
Cited
US3867294A
Cited
US4033881A
Cited
US4248924A
Cited
US4154688A
Cited
US4377010A
Cited
US4414280A
Cited
US4304579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |