US4680118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pleated and sealed filter cartridge with connected film
Assignee: Mitsui & Co Ltd
•
Filing: 1985-10-21
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Granted: 1987-07-14
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Expires: 2005-10-21
Abstract
Abstract A cartridge filter comprises a pleat-type porous membrane having a longer length than an effective filtering surface thereof; upper and lower end plates; a plurality of segmented cylindrical core members disposed between the upper and lower end plates; and protective caps for fastening and sealing an upper and lower reminder of the pleat-type porous membrane other than the effective filtering surface thereof. Each of said end plates is provided with a plurality of fins, each of which is covered by the pleat-type porous membrane. The pleat-type porous membrane is folded at each corner of respective end plates and fastened firmly between the end plate and the protective cap by melting means, adhesion or sealing means.
Inventors
- 👤 Jun Taga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:25
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/067; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D39/00; B01D39/14; B01D39/16; B01D39/1692; B01D2201/00; B01D2201/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A cartridge filter comprising: a pleat-type porous membrane having a longer length than an effective filtering surface thereof; a cylindrical body; a lower plate; a plurality of fins extending radially from a lower part of said upper cylindrical body and from said lower plate; each of said plurality of fins being covered by said pleat-type porous membrane; and said pleat-type porous membrane extending through said plurality of fins being folded and disposed along an outer circumference of said upper cylindrical body and fasteningly sealed at one end, wherein a thin and flexible film is connected to said folded or sealed end portion of said porous membrane.
Claim 2
Dependent Claim
106 words
A cartridge filter comprising: a pleat-type porous membrane having a longer length than an effective filtering surface thereof; a cylindrical body; a lower plate; a plurality of fins extending radially from a lower part of said upper cylindrical body and from said lower plate; each of said plurality of fins being covered by said pleat-type porous membrane; and said pleat-type porous membrane extending through said plurality of fins being folded and disposed along an outer circumference of said upper cylindrical body and fasteningly sealed at one end, wherein a thin and flexible film is connected to said folded or sealed end portion of said porous membrane.
Claim 3
Dependent Claim
22 words
A cartridge filter as claimed in claim 1, in which an end of said porous membrane is cut-off in a L-shaped form.
Claim 4
Dependent Claim
25 words
A cartridge filter as claimed in claim 1, in which said porous membrane is placed upon said lower plate and covered by a protective cap.
Claim 5
Dependent Claim
22 words
A cartridge filter as claimed in claim 3, in which said protective cap allows discharge of a fluid in a circumferential direction.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |