US4184966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular filter elements with improved side seam seal
Assignee: Individual
•
Filing: 1977-09-29
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Granted: 1980-01-22
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Expires: 1997-09-29
Abstract
Abstract Tubular filter elements are provided having an improved side seam seal which can be bonded to end caps in a leak-tight manner and can be formed of a thermoplastic material which is the same plastic material as the end caps and/or of the filter elements, improving the bonding of the side seam seal to the end caps and filter elements.
Inventors
- 👤 David B. Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:51
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/70; B29C66/72; B29C66/723; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B29C65/00; B29C65/02; B29C65/18; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/50; B29C65/5064; B29C65/5071; B29C65/5085; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5344; B29C66/61; B29C66/612; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; B29C53/00; B29C53/36; B29C53/38; B29C53/40; B29C65/4825; B29C65/483; B29C65/4835; B29C66/71; B29C66/7232; B29C66/72324; B29C66/72326; B29C66/72327; B29C66/72328; B29L; B29L2009/00; B29L2016/00; B29L2031/00; B29L2031/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
170 words
A tubular corrugated filter element comprising two layers of filter sheet material formed in a substantially tubular shape and having the inner surface of the end portions of the outer filter sheet and the outer surface of the end portions of the inner filter sheet in adjacent relation, and joined together in a side seam seal by way of an interposed self-supporting bonding channel strip of thermoplastic resinous material folded over the outer end edges of the inner filter sheet, so that the end edges thereof are embraced by the channel strip, the channel strip being bonded to the abutting surfaces of the inner and outer filter sheets, thereby sealing the edges of the two sheets together in a leak-tight seal, and blocking the escape of unfiltered liquid between the edges of the inner filter sheet of the tubular filter element into or out from the space enclosed by the inner filter sheet and preventing bypassing of unfiltered liquid from the upstream to the downstream sides of the filter sheets.
Claim 2
Dependent Claim
170 words
A tubular corrugated filter element comprising two layers of filter sheet material formed in a substantially tubular shape and having the inner surface of the end portions of the outer filter sheet and the outer surface of the end portions of the inner filter sheet in adjacent relation, and joined together in a side seam seal by way of an interposed self-supporting bonding channel strip of thermoplastic resinous material folded over the outer end edges of the inner filter sheet, so that the end edges thereof are embraced by the channel strip, the channel strip being bonded to the abutting surfaces of the inner and outer filter sheets, thereby sealing the edges of the two sheets together in a leak-tight seal, and blocking the escape of unfiltered liquid between the edges of the inner filter sheet of the tubular filter element into or out from the space enclosed by the inner filter sheet and preventing bypassing of unfiltered liquid from the upstream to the downstream sides of the filter sheets.
Claim 3
Dependent Claim
28 words
A tubular filter element according to claim 1 having end caps closing off the ends of the tubular element, and bonded to the ends in a leak-tight seal.
Claim 4
Dependent Claim
52 words
A tubular filter element according to claim 2 in which the bonding channel strip in the side seam seal is of the same thermoplastic resinous material as the end caps, and the bonding strip material is integrated with the end caps in the side seam seal, forming an integral one-piece filter element.
Claim 5
Dependent Claim
52 words
A tubular filter element according to claim 2 in which the bonding channel strip in the side seam seal is of the same thermoplastic resinous material as the filter sheets, and the bonding strip material is integrated with the filter sheets in the side seam seal, forming an integral one-piece filter element.
Claim 6
Dependent Claim
61 words
A tubular filter element according to claim 2 in which the bonding channel strip in the side seam seal is of the same thermoplastic resinous material as the end caps and the filter sheets, and the bonding strip material is integrated with the end caps and the filter sheet material in the side seam seal, forming an integral one-piece filter element.
Claim 7
Dependent Claim
34 words
A tubular filter element according to claim 2 wherein the end caps are bonded to the ends of the tubular element by a synthetic resin which impregnates the filter sheet material at such ends.
Claim 8
Dependent Claim
20 words
A tubular filter element according to claim 2 in which the end caps and bonding channel strip each comprise polypropylene.
Claim 9
Dependent Claim
20 words
A tubular filter element according to claim 2 in which the filter sheets and bonding channel strip each comprise polypropylene.
Claim 10
Dependent Claim
22 words
A tubular filter element according to claim 2 in which the end caps, bonding channel strip and filter sheets each comprise polypropylene.
Claim 11
Dependent Claim
19 words
A tubular filter element according to claim 1 in which the bonding channel strip is of heat-softenable thermoplastic material.
Claim 12
Dependent Claim
27 words
A tubular filter element according to claim 1 in which the bonding channel strip is of an initially thermoplastic material polymerized to a nonthermoplastic stage of polymerization.
Claim 13
Dependent Claim
33 words
A tubular filter element according to claim 1 in which the bonding channel strip has penetrated at least slightly into the pores of the abutting of filter sheets in the side seam seal.
Claim 14
Dependent Claim
16 words
A tubular filter element according to claim 1 wherein the filter sheet material is a paper.
Claim 15
Dependent Claim
19 words
A tubular filter element according to claim 1 in which the sheet material is folded in a corrugated configuration.
Claim 16
Dependent Claim
27 words
A tubular filter element according to claim 1 in which the inner filter sheet is of fine porosity, and the outer filter sheet is of coarse porosity.
Claim 17
Dependent Claim
27 words
A tubular filter element according to claim 1 in which the outer filter sheet is of fine porosity, and the inner filter sheet is of coarse porosity.
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) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |